Magento payment module example jobs

The pcb will be done using easy eda.. Garber, BOM and CPL needed to be deliver

I run an existing business and I'm seeking a web developer proficient in Magento 2 to help optimize my site's performance, specifically targeting the First Input Delay (FID). Current Situation: - I have insights on the site's performance, but they're not clear-cut. Ideal Candidate: - An expert in Magento 2 with a deep understanding of core web vitals. - Ability to interpret performance data and implement effective improvements. - Clear communication skills to explain complex issues in a simple way.

...focus on user experience and conversion optimization. Requirements: - Develop an e-commerce website with a shopping cart feature - Implement a secure payment gateway for seamless transactions - Enable user registration for a personalized shopping experience Skills and Experience: - Proficiency in web development technologies such as HTML, CSS, JavaScript, and PHP - Experience in designing and developing e-commerce websites, preferably with examples of previous work - Knowledge of responsive web design principles to ensure the website is mobile-friendly - Familiarity with popular e-commerce platforms and CMS (e.g., Shopify, WooCommerce, Magento) - Understanding of SEO best practices to optimize the website for search engines If you are a creative and experienced web deve...

You can see more details on our chat. :: REFERENCE Use this example to review purchase steps. Make it very similar with the same steps. REQUIREMENTS: - Buy Now Widget: A popup widget for Google Pay, PayPal, Apple Pay, Amazon, or credit card checkout. - Payments via Stripe: PayPal, Google Pay, Amazon, Apple Pay, and credit cards. - Order Bump: Option to add an extension course at checkout. - Publish on for testing.

I'm seeking a freelancer to create a handwriting recognition module for grading handwritten test papers. The module should be able to: - Recognize both cursive and printed handwriting - Understand and interpret complex technical diagrams - Separate answers based on identifiers like answer numbers - Ignore crossed-out content -The engine should be self learning - the more handwritten notes are submitted, the more the accuracy increases. This is a high-stakes project requiring a high level of accuracy. Ideal candidates will have experience with machine learning, computer vision, and handwriting recognition systems. Familiarity with grading systems and educational assessment processes will be a plus. Please include relevant past projects in your proposal.

...apps. This is intended to be a long-term project. Key Features: - Cross-platform compatibility: The app should work seamlessly on both Android and iOS devices. - Comprehensive web-based integration: The app should include a User Dashboard for booking and ride history, an Admin Panel for managing services, and a Customer Support Portal. Furthermore, there should be a dedicated Service Provider Module and Dashboard. - Ride booking: The primary function of the app is to allow users to book various types of transport. Please note that the app's development will require skills and experience in: - Cross-platform app development - Web-based feature integration - Designing user-friendly interfaces - Implementing robust backend systems - Ensuring top-notch app maintenance and upda...

...specifically targeting indices like Bank Nifty and Nifty. The application will consist of three main modules: - **Module 1**: This module will take real-time data from a data feed provider via their API. For initial testing, the Yahoo API can be used temporarily. - **Module 2**: This is the 'Buy Sell Hold Logic' module. It needs to support automated trading signals, user-configurable trading strategies, risk management features, and orders based on certain calculations over various time periods. We will provide code for the strategies, for example buy sell depends on super trend , then we provide code for super trend, the user shall be able to fine tune parameters, example two we are planning 3 strategies combined together to generat...

...website. This form should allow users to enter their Instagram username (with a check to ensure it starts with @) and upon clicking submit, they should be redirected to a payment page. Key Requirements: - The form must be integrated into my existing website. - Payment system will be UPI, so knowledge and experience with UPI integration is essential. - After the user makes an instant payment, their payment should be verified using an API (details and documentation will be provided). - Upon successful payment verification, the user should be redirected to a success page. This page should include their Instagram username, payment details, and a random mix of numbers and Instagram details. No user authentication is required before entering the Ins...

I'm looking for a professional with extensive experience in Odoo POS and hardware integration to configure my digital weight scale with my Odoo 14 POS system. The weight scale connects via USB, so a strong understanding of Odoo's hardware interface capabilities is crucial. Skills and Experience Needed: - Proficiency in Odoo 14, particularly the POS module - Experience with integrating USB devices with POS systems - Knowledge of configuring digital weight scales with POS - Problem-solving skills for troubleshooting integration issues - Good communication skills for understanding and addressing project requirements

...specifically targeting indices like Bank Nifty and Nifty. The application will consist of three main modules: - **Module 1**: This module will take real-time data from a data feed provider via their API. For initial testing, the Yahoo API can be used temporarily. - **Module 2**: This is the 'Buy Sell Hold Logic' module. It needs to support automated trading signals, user-configurable trading strategies, risk management features, and orders based on certain calculations over various time periods. We will provide code for the strategies, for example buy sell depends on super trend , then we provide code for super trend, the user shall be able to fine tune parameters, example two we are planning 3 strategies combined together to generat...

I need assistance uploading 1000 products to my Magento store. Product Information: - I have all the product details ready which include descriptions, images, and pricing. - The information is not in a standard format, so some preliminary data processing may be needed. Skills and Experience Required: - Extensive knowledge and experience with Magento is essential. - Proficiency in data processing and Excel is required, as the product information will need to be formatted for Magento. - Attention to detail is critical to ensure all product information is uploaded correctly.

I'm seeking a skilled programmer to write an Arduino code for a BQ25887 USB charging IC. The code should manage the initiation of charging for two Lion batteries, ensure cell balancing, and support 5V 3A charging from any standard adapter. I am using a MIKROE Balancer 5 click. () Key Requirements: - Charging...Input power availability. - Read system status flags - Experience with Arduino and BQ25887 IC is essential. Ideal Skills: - Proficiency in Arduino programming. - Prior experience with BQ25887 USB charging IC. - Knowledge of lithium-ion battery charging and management. - Ability to create user-friendly code with both manual and automatic options. Please find the mentioned link of the BQ25887 Module: lion

...Responsibilities: Website Planning and Research: Propose a user-friendly structure and layout that builds trust and simplifies navigation. Suggest the best themes and designs that align with the airport transfer industry. Search Module Analysis: Research how search functionalities work on competitor websites. Provide detailed recommendations for an efficient and intuitive search module. Competitive Analysis: Study competitor websites to identify key features and pain points. Highlight what they emphasize, such as pricing, service descriptions, and user reviews. Feature and Module Development: Research and propose modules, such as: Customer reviews. Email collection tools (e.g., free guides or discounts). Booking and pricing calculators. Add your own innovative ...

...customizations to the virtual environment in real-time. 6. About Section: * Design informative panels or 3D objects using Unity's UI tools to present information about VRET, its benefits, and the evidence-based approach. * Incorporate interactive elements like clickable buttons or interactive diagrams to engage users and encourage exploration of the content. 7. How It Works Module: * Create scripted sequences or interactive tutorials using Unity's animation and timeline tools to explain the therapeutic process of VRET. * Implement visual aids, such as diagrams, animations, or virtual demonstrations, to illustrate key concepts and techniques used in emotional regulation therapy. 8. Avatar Support: * Design and animate a vir...

I am seeking a professional to assist with a crucial upgrade of the Teleperm XP SPPA-T3000 system. This project focuses solely on enhancing the software components of the system, particularly the user interface and data processing module. Ideal Skills and Experience: - Extensive knowledge and experience with Teleperm XP SPPA-T3000 systems. - Strong software upgrade expertise, particularly with user interfaces and data processing modules. - Proven track record in system upgrades. - Excellent problem-solving skills. - Strong attention to detail. Please only bid if you have the required skills and experience.

I need a Spring Boot expert to finalize an almost complete password change feature. The system should allow users to change their passwords in the Settings module, with the following functionalities: - Pre-filling user information from the User table. - New password input. - Verification of password against security requirements using the Passay library. - Encryption of the new password and updating it in the User table. - Displaying a confirmation of the password change. You will also need to handle an alternative flow for invalid passwords, where the system displays an error and the user can try inputting a new password. You don't need to worry about the integration with Docker, PostgreSQL, or Thymeleaf, all of that is already set up. Your main focus is on the completion o...

I need a comprehensive software solution for managing insurance claims in a hospital setting, complete with a corresponding website. Key Features: - The software's primary function will be processing insurance claims. - It should include a module for claim submission, tracking, and an approval workflow. User Roles: - The system should cater to three main user roles: Admin, Healthcare Provider, and Insurance Agent. Ideal Skills: - Proficiency in software development, particularly in creating systems for insurance claim processing. - Experience with user role management and security considerations. - Ability to integrate a software with a corresponding website. Desired Experience: - Prior work in the healthcare sector or with healthcare software will be highly regarded. - Dem...

I'm seeking a Magento specialist to optimize my site for improved loading speeds and user experience. The focus will be on the homepage and checkout process. Key requirements: - Extensive experience with Magento site optimization - Proven track record of enhancing loading speeds and user experience - Ability to specifically target and improve homepage and checkout process - Skills in identifying and implementing necessary optimizations for SEO and overall site performance

I'm looking for an AI module that can process school textbooks, specifically in Mathematics and Science. This module should be capable of identifying and extracting questions, answers, chapter titles, and key concepts from these textbooks. Key Requirements: - The AI module should be able to handle school-level Mathematics and Science textbooks. - It should be capable of extracting a variety of details from the textbooks, not just questions and answers, but also chapter titles and key concepts. Ideal Skills: - Proficiency in AI and machine learning. - Experience with natural language processing. - Familiarity with Mathematics and Science school textbooks.

I'm seeking a skilled developer to integrate my payment page with the Moyasar platform. The ideal candidate should have a solid understanding of payment systems and currency handling, as I want to support multiple currencies, specifically all available currencies, with a focus on USD, EUR, and GBP. Requirements: - Link my payment page to Moyasar - Ensure all currencies are supported - Implement seamless currency conversion - Maintain high level of security and compliance Skills & Experience: - Proven experience with Moyasar integration - Strong understanding of multi-currency payment systems - Knowledge of security protocols for online payment systems - Ability to deliver a user-friendly payment interface

...history, and allow tracking of communication with customers. Enable the ability to transfer numbers seamlessly and track outreach efforts efficiently. Google Calendar Integration: Sync jobs and tasks with Google Calendar to streamline team scheduling. Allow shared calendar access for real-time updates on job assignments, deadlines, and team availability. Invoice and Billing System: Implement a module for generating, tracking, and sending invoices directly from SuiteCRM. Ensure the system integrates with your accounting software (e.g., QuickBooks) for a smooth billing workflow. Estimation Automation with QuickBooks: Automate the process of creating and sending job estimates using QuickBooks. Ensure estimates are linked to customer profiles in SuiteCRM for seamless tracking. Kla...

I have an ATV electronic drum kit with an aD5 sound module, a Focusrite Scarlett 2i2 Audio Interface, a Behringer XenyX Q1202USB mixer, and Reaper 7.3 DAW on a Dell Inspiron Computer. I need assistance connecting these components so I can record playing the drums along with MP3 music files using Reaper. - My main difficulty lies in connecting the hardware components - I want to monitor audio during recording sessions using both headphones and studio monitors - I have all the necessary cables for connecting these components Ideal candidates for this project should have experience with electronic drum kits, Focusrite audio interfaces, Behringer mixers, and Reaper DAW. They should also have a good understanding of audio setup for recording. Please reach out if you can help me get th...

I'm seeking a professional with experience in setting up Odoo 18 for a small business in Argentina. The project involves setting up three modules: Finance, Task Management, and Invoicing, with some specific requirements and customizations. Key Tasks: - Finance Module: Configured for budgeting. - Task Management Module: Set up similarly to Trello. - Invoicing Module: Basic modifications to comply with Argentine tax laws (CAE, expiration dates, IVA). Future considerations: The setup should be scalable for a full Project Management configuration down the line. Training: I will need basic user training for three team members. Local Expertise: Familiarity with AFIP and Argentine tax regulations is a plus. Ideal candidates will be Odoo certified professionals with...

I need to develop a module that includes KYC (Know Your Customer). The idea is to be able to sign a contract online, where the person can be validated with their face and also their official ID from their country, which in this case would be the image. The person would sign digitally on the web, and in addition, the information of their face and official ID data would be stored to verify that the person really signed. I would like the project to be in .NET 9 for the backend and Vue 3 for the frontend. Let me know if you need any adjustments!

I require a seasoned FileMaker developer to augment my bespoke recruitment agency's CRM with a new 'Bookings' module. This is a continuation of work on a previously created MVP version, so familiarity with the existing setup is crucial. Key Aspects of the Project: - Development of a 'Bookings' section within the CRM. - Incorporation of a 'Timesheets' subsection with features including: Automated calculations, Approval workflows, and Reporting & Analytics. - Calendar integration within the 'Bookings' module, ensuring seamless scheduling capability. - Future scalability to include 'Marketing' functionalities, and integrated Email & SMS capabilities. Ideal Candidate: - Proven expertise in FileMaker software develop...

Nestor, the next phase of this project is to have a URL to a job uploaded with the resume. I need the url to be passed to the Resume Assistant in our current workflow (the module I added) because it looks for it: "Optimize the uploaded resume for ATS compatibility based on the provided job description. Job description link: [Insert URL here] Ensure the following:

I'm in search of a ready-made, white-label crypto exchange. The platform should allow for user registration and login, with a pri...Trading - Convert Crypto - OTC Market -Accept all major fiat currencies - Futures Trading -Options Trading -P2P Market -Merchant Payments -Launch ICO -List Coin -Mining Pools -Create your own Asset -List your own Asset -Affiliate & Sub-Affiliate Marketing (IB) -Analytics to track your Exchange performance -Social Feature to share your exchange -GPT Integrated AI Advisor -Full Featured Compliance Module -Developer APIs - android , iOS app - additional staff account managment -marketing feature for exchange Please, only bid if you have a demo ready. Your experience with crypto exchanges and your ability to deliver a comprehensive, functional pl...

...PHP. We had our Magento website which had HTML built pages migrated to wordpress/woocommerce. In order to migrate successfully, there was some things done beyond our knowledge to make it look the exact same. This includes using Elementor page builder and certain plugins perhaps to make things work. The Issue We have a top main menu which acts like a Mega Menu. This was originally full HTML and CSS with maybe some JS. This was made to work on the new Wordpress site using mentioned plugins. If we change the name of the current main menu (primary menu) options and save, the names are reflected on the front end of the site, so this is good. However if we try to add any new menu options to the main menu, the menu options down display the same as the original options. Example...

I'm looking for a professional with extensive experience in developing a QR Code and NFC Payment System. Key Requirements: - The payment system needs to be compatible with both smartphones and tablets. - The system should primarily support digital wallets as the main payment method. - While I haven't specified particular digital wallets, an understanding and experience with integrating popular ones like Apple Pay, Google Wallet, and Samsung Pay would be beneficial. Ideal Skills: - Proficiency in QR Code and NFC technology. - Prior experience with digital wallet integration. - Knowledge of mobile device compatibility and payment system development. Please provide examples of similar projects you've completed in your proposal. Thank you!

I'm in need of a skilled web developer who can create an attractive, fully-functional e-commerce website at a low cost. The goal is to design a site ...website at a low cost. The goal is to design a site that is sellable to others, with a specific focus on an insurance company's product. Key Requirements: - Development of an appealing e-commerce site - Integration of essential e-commerce features - Cost-effective solutions Ideal Skills: - Proficiency in various e-commerce platforms (Shopify, WooCommerce, Magento) - Web design skills - Understanding of e-commerce features (product reviews, payment gateway integration, customer login) - Ability to create a site that meets specific industry standards (in this case, insurance) - Capacity for delivering quality work at...

Job Description: We are seeking an experienced Shopify developer to integrate the Qliro Checkout payment provider on our Shopify store. This involves installing the necessary apps, configuring the integration, testing functionality, and ensuring the payment gateway is fully operational. Details: Current Setup: Shopify store in operation. Required Apps: Qliro Checkout App: Candy Rack for Upsell: API Keys: Production API keys will be provided (valid for 7 days). Additional keys for future stores will be provided upon completion. Tasks: Install and configure the Qliro Checkout app for Shopify. Set up the

...looking for a robust all-in-one solution for managing my spa business, I need a software that facilitates booking, scheduling, billing, tracking employee attendance, managing membership redemptions and more. The software should be compatible for web , making it easily accessible at any time, anywhere. Essential components: • An online booking system that handles real-time scheduling. • A calendar module for managing appointments effectively. • A comprehensive customer database to store contact information, booking history and membership details. Ideal skills and knowledge for the project: • Experience with web and mobile app development. • Understanding of data management for implementing a customer database. • Experience in integrating a real-t...

Instalar app Easyship en magento 2 open source, para un sitio ecommerce. El sitio se encuentra en Cloudways, una vez estimado el costo se envián el usuario y contraseña del sitio para hacer la instalación.

My company () develops webshops based upon the Magento commerce solution. Please read about it on the site. For the "blog" section we are looking for a freelancer to write unique and well researched articles. Our current blog posts are too "thin" in content and we want to improve the quality. As a trial, would like to ask you to write an article about "Gen Z - And how they like to pay "

I'm seeking an experienced hardware and firmware developer to create a WiFi-enabled pen drive using an ESP32 module and an SD card module. This device should function as a traditional USB pen drive while also enabling wireless data transfer and management. Key Requirements: - The primary use case for this device is business file sharing. This means it should be able to handle large files, work reliably, and be user-friendly. - For the wireless management and data transfer, I'm specifically interested in the FTP protocol. - In terms of security, the device should include password protection to ensure secure file sharing. Ideal Skills and Experience: - Extensive experience in hardware and firmware development. - Prior work with ESP32 modules and SD card modules. - F...

I'm seeking a seasoned hardware and firmware developer to engineer an offline, WiFi-compatible USB pen drive via an ESP32 module paired with an SD card module. This device should operate as a conventional USB pen drive, whilst also facilitating wireless data transfer and management. Key Requirements: - The primary function of this device is to support wireless data transfer, specifically enabling file sharing between multiple devices. - Compatibility is crucial. The pen drive must support seamless wireless file sharing across Windows, macOS, and Linux operating systems. Ideal Skills: - Extensive experience in hardware and firmware development. - Proficiency with ESP32 and SD card modules. - Strong understanding of USB drive functionality and wireless data transfer mech...

I'm in need of professional assistance with my SuiteCRM instance installed on an AWS Lightsail server. Key Tasks: 1. Troubleshoot an error: "Error: Query limit of 5000 reached for Contacts module". 2. Review the installation and provide recommendations for an upgrade. 3. Evaluate the current backup strategy and perform tests accordingly. Please ensure to include "SuiteCRM" in your quote. Thank you in advance for your proposal and assistance.

My Magento 2 site is facing a critical checkout issue where payments are not processing. This is specifically related to the Stripe payment gateway. Key Requirements: - Immediate start is required. - Strong debugging skills are necessary to identify and fix the issue. - Expertise in troubleshooting payment gateways, particularly Stripe, is essential. - Experience with Magento 2 and dealing with plugin or extension updates is highly preferred.

I need an expert to set up my Instamojo smart pages with a payment gateway for selling digital products. The gateway should specifically support: - One-click payments: This is essential for ensuring a smooth and swift purchase experience for my customers. Please note, this project does not require multi-currency support. Ideally, you should have significant experience working with Instamojo and configuring payment gateways for digital products. Your expertise will be critical in enhancing my customers' purchasing experience and ultimately, boosting sales.

I need a highly skilled WordPress developer experienced in custom development, function implementation, module development, and plugin development. The project primarily involves: - Integrating a custom API with Woocommerce, with a specific flow to be added. - Implementing essential features for a membership system, specifically subscription payment integration. The type of API integration required is with a third-party service, so familiarity with this kind of work is essential. Ideal candidates for this project should have: - A strong background in WordPress custom development. - Extensive experience with Woocommerce. - Proven track record in API integration, particularly with third-party services. - Experience in developing and implementing custom modules and plugins.

I'm in need of a Kotlin code base APK that has been fully configured for end-to-end (E2E) use. Two source code full module is available. Key Requirements: - Need both module APK with full e2e working. The code is already ready just need to build apk from local build. Also firebase setup detatils with documentation Buget is only 500

I'm looking for an experienced Yii framework developer to integrate the Paytr payment gateway into my Codecanyon script. The script comes with detailed documentation, so you should be able to follow that to complete the integration. Your tasks will primarily involve: - Integrating Paytr payment gateway into the script - Utilizing the provided detailed documentation to guide the integration process - Troubleshooting and resolving any potential issues that may arise during the integration process Ideal candidates for this project should have: - Extensive experience with Yii framework - Proven track record of successful payment gateway integrations - Strong problem-solving skills - Ability to work with detailed technical documentation Please note that I have not s...

...optimization. Backtest and analyze strategy performance. Provide documentation, deliverable code, and a final report. 2. Key Deliverables Data Management & Integration Scripts/Processes to fetch and organize GDFL 1-min data (NSE & BSE). Integration of purchased Level 2 data into a unified format. Data cleaning, timestamp alignment, outlier detection, and basic quality checks. Greeks Computation Module A reliable script/tool to compute Greeks for each option contract (Delta, Gamma, Theta, Vega, etc.) using a standardized model (e.g., Black–Scholes). Verification checks comparing computed Greeks with reference or market data. Feature Engineering Creation of technical indicators, order book–based features (market imbalance, spread, etc.), and Greeks-based fea...

...application for users (no need for an interface, console is fine). Requirements: 1. Write a Python program with at least 200 lines of code, adhering to best coding practices. 2. Use basic Python concepts: loops, lists, control flow, functions, strings, dictionaries, file handling, and modules (csv, random). Please do not use any complicated Python stuff. 3. Make sure it contains: 3.1 usage of the csv module for creating, reading, writing and loading from the csv file for processing of data like loading it into a data structure. 3.2 Include basic programming stuff like list slicing, loops, if-else statements, taking input from the user using the input function and output the menu to the user and other details, as required by the function. 3.3 Arithmetic, comparison operators as ...

Hello, I would like a website without online sales (no ecomme...store. The color scheme should revolve around "wine red" (Bordeaux), white, and dark brown (you can keep just two or suggest an alternative combination). I would like a calendar for workshop reservations: A maximum of 2 simultaneous reservations (2 workbenches available). Three types of workshops: Create a piece of jewelry in half a day. Create a jewelry set over two days. A giftable workshop module. Reservations should send automatic emails to both the client and me. Payments must be made immediately via a platform like Stripe or another of your choice. The website should be entirely in French, and I will provide most of the text, images, and videos. Here is my current website for reference:

I'm in search of a skilled developer to create a comprehensive library management system. This system should be robust and user-friendly, featuring: - Book Registration: A module that allows for the input of book details such as title, author, publication date, and number of copies. - Book Search: A search functionality that enables users to find books based on their title or author. - Book Borrowing Management: A system for registering book loans to library members, inclusive of tracking due dates for returns. - Reports Generation: The ability to generate various reports, such as those detailing borrowed books, returned books, and the total number of books in the library. The system should employ a database, with a preference for SQLite, to store book and user information. A...

I am looking for a talented designer to create a corporate branding package for my small startup regarding payment plugins of WordPress. The ideal candidate will have experience in creating professional and trustworthy branding materials. Including logo assets, a few banners, product introduction images, etc. If the branding finishes well, I am planing to upgrade the official website with new branding so we can continue to corporate.

We are developing a Hospital Management System (HMS) using Odoo, where the Doctor Dashboard is a critical feature. The goal is to dynamically display all patient records in the Doctor Dashboard, enable doctors to record consultation details seamlessly, and maintain a consultation history log for each patient, similar to how activities and records are logged in Odoo CRM for quotations/invoic...models should remain independent while enabling interaction and preserving consultation records. Expectations from a Consultant: 1. Dynamically display patient data in the Doctor Dashboard. 2. Enable seamless navigation between the dashboard and consultation form. 3. Log consultations in the patient's history automatically. We are using Odoo 18 SaaS model for the implementation of a custom HMS...

I am seeking a talented Full Stack Developer for a full-time engagement. If you're an individual freelancer with expertise in modern web and desktop app technologies, i want to hear from you! Required Skills: - MUI - Tailwind CSS - React.js - - - TypeScript - Node.js - Prisma - MySQL - AWS Work Details: - Schedule: Monday to Saturday - Hours: 8 hours per day - Payment: Monthly basis (10K) Who Can Apply: - Individual freelancers only (no agencies) - Must be able to demonstrate past work or projects in the required tech stack. If you meet the criteria and are passionate about full-stack development, drop your bid with your portfolio and let's collaborate!

I'm looking for a web-based program that can help me keep track of job participants, their payment statuses, and visualize data through a bar chart. Key Features: - Each participant should have a unique ID for identification. - A section to add new participants, requiring their Name and Contact Details, Date Joined and Payment Status. - Capability to indicate how many people are involved in a job and how many have made a payment. - A chart to visualize the number of participants added each month. Access: - Users should be able to log in with a Username and Password. Ideal Skills: - Proficiency in web development. - Experience with data visualization and creating interactive charts. - Knowledge in user authentication systems.