Vacancies junior php developer in karachi sindh jobs

I'm in need of a highly experienced Spring Boot developer, with over 10 years of professional experience, to assist in building new applications. Skills and Experience: - Rich Experience in Spring Boot over 10 years. - Excellent algorithm and coding skills - Strong background in application development - Ability to work independently - Fluency of English for the Discussion Please note that the specifics of the application components and framework integrations are yet to be defined, as they are dependent on the project scope. Your experience and input will be invaluable in shaping this.

I'm developing a color trading website and need a skilled Node.js developer. The key functionalities for the site include: - User login and registration: A secure and efficient system for users to create accounts and log in. - Real-time color trading marketplace: This is the core of the website, requiring the implementation of a seamless, real-time trading experience. - Analytics and reporting: A system to track and display trading data, user statistics, and site performance. The ideal freelancer for this project would have extensive experience in Node.js and real-time application development. Familiarity with trading platforms or e-commerce websites would be a significant advantage.

I have a specific WordPress/PHP theme that needs to be installed and configured on my website. Ideal Skills and Experience: - Extensive experience with WordPress and PHP - Proven track record of installing and configuring WordPress themes - Strong understanding of website scripting - Excellent attention to detail to ensure the theme is set up correctly Please note, the theme is compatible with the latest version of WordPress/PHP.

Description: I am looking for a skilled WordPress developer to create a professional, responsive website for my company, Merchant Matrix AI. The site will highlight our AI-driven solutions for customer support and include an integrated AI-powered chat feature utilizing OpenAI. Project Scope: 1. Website Development: -Build a WordPress website with a clean, modern design. -Key pages: Homepage, Features, Pricing, Testimonials, Contact/Consultation. -Integrate interactive elements like animations and responsive layouts. 2. AI-Powered Chat: -Develop a webpage chat widget powered by OpenAI (e.g., GPT-4 or similar). Features: -Respond to user queries dynamically. -Customized prompts to align with Merchant Matrix AI branding and services. -Display "Powered by Merchant Matrix A...

I am in need of a seasoned PHP and WordPress web developer to manage our cloud systems. This will involve taking ownership of our VPS system health, including: - Monitoring and maintaining system health - Applying security patches - Optimizing performance You will also be responsible for Web App Development and managing Microsoft XML Plugins. Your key duties will include: - Overseeing the VPS system health - Managing and applying necessary security patches - Engaging in web app development The majority of web app development will primarily focus on PHP. Ideal candidates should have: - Extensive experience with PHP and WordPress - Proven track record in managing VPS systems - Strong skills in applying security patches - Proficie...

I'm in need of a skilled Frontend (React, Vue.js) and Shopify developer for a web project. Key Responsibilities: - Assist with State Management in the React project. Ideal Skills: - Proficient in React and Vue.js. - Experienced with Shopify and Webflow. - Strong knowledge of State Management techniques. - Previous work with UI/UX Design and Component Development is a plus. Please note that the specific state management library is not predetermined, we can discuss together what's best for the project.

...time its a very small project. I need a .Net Maui developer for a small but urgent project. The task is to create a basic online shop app with .Net Maui 8. Key Features: - An online shop with 3 sales categories, catering to 2 types of clients: Corporate (Corp) and regular consumers. - User profiles for login purposes using name and telephone number. - A shopping basket that can be modified (adding & deleting items). - A checkout process displaying a summary of all items and prices. Note: Corp customers will have a different payment timeline (end of the month). - Storage of Corp client data via either file I/O or a SQLite database. This should be built on Maui 8 & this will run on local emulator only Further project specifics can be discussed in detail. Please on...

The project involves creating an e-commerce platform using Shopify integrated with a marketing site designed on Webflow. The ideal freelancer should have: - Extensive experience in both Webflow and Shopify and other CMS platform. - Proficiency in e-commerce setup, custom coding, and web design. - Skills in SEO, UX/UI design, and responsive web design. - Plus Front-end(react, vue.js) - Location: Colombia, Argentina, Uruguay, Mexico I am seeking a professional who can take charge of the design, layout, and technical aspects of this project, ensuring a seamless integration between the two platforms. The ability to work independently and deliver on time, while maintaining high-quality standards, will be key to our collaboration.

Must have build a Provability fair game before and can provide demo of previous games...Provability fair game before and can provide demo of previous games. I'm looking for a skilled Unity developer to help with my crash game. Your role will encompass game mechanics development, backend integration, and UI/UX design. Key Responsibilities: - Developing engaging game mechanics - Integrating a robust backend for real-time communication - Designing a user-friendly UI/UX The backend will primarily involve real-time communication. Experience in this area is crucial. I prefer using an SQL-based database for this project. Please, bring your expertise in database management and game development to the table. Your ability to design intuitive UI/UX will be key in ...

My WordPress site requires an upgrade to enhance its mobile responsiveness and overall performance. Key Issues: - Mobile Responsiveness: The site content is not displaying correctly on mobile devices, particularly the 'Bunner'. - Performance: The site is slow when accessed on a mobile device. - Upgrade PHP version Ideal Skills: - Proficient in WordPress development and troubleshooting. - Strong understanding of mobile optimization techniques. - Experience in improving site performance and load speed.

I'm seeking a skilled full-stack software developer with extensive experience in Java for the development of a web-based supply chain application. Key Features: - The application will primarily focus on facilitating purchasing bidding within the supply chain. Ideal Candidate: - Proficient in Java with a strong full-stack development background. - Prior experience in developing web applications, particularly in the supply chain domain, will be a significant advantage. - Excellent understanding of purchasing bidding processes.

I'm in need of a seasoned Front-end Developer to assist in building a website with a CRM focus. The primary features of this CRM will include contact management and customer service. Key Responsibilities: - Collaborate with our team to design and implement user-friendly front-end components. - Ensure the website is optimized for performance and scalability. - Incorporate elements of customer service into the CRM interface. Ideal Skills: - Proficiency in HTML, CSS, JavaScript and relevant front-end frameworks. - Previous experience in developing CRM websites. - Strong understanding of customer service interface design. - Good English Communication. We are looking for a developer who can turn our vision into a functional, efficient and visu...

We are seeking a skilled and experienced developer to design and build a Token Presale Dashboard for our upcoming token project presale. The ideal candidate will have a strong background in blockchain technology, user interface design, and secure payment integration. This dashboard will be the central platform for users to participate in the presale, monitor their token purchases, and manage their transactions. Key Responsibilities: • Develop and deploy a secure and user-friendly Token Presale Dashboard. • Integrate cryptocurrency wallet connectivity (e.g., MetaMask, Trust Wallet). • Enable real-time token price calculations and daily price adjustments. • Implement secure payment options for multiple cryptocurrencies and fiat currencies. • Prov...

I am looking for professionals experienced in developing macros for SolidWorks, specifically in the SWOOD module. The goal of the project is to optimize and automate key processes within this environment, ensuring efficiency and precision in design. Key Requirements: - Proven experience in developing macros in SolidWorks. - Advanced knowledge of the SWOOD module. - Ability to understand and adapt solutions to customized processes. - Capacity to document and explain the developments made. - Good communication skills and willingness to collaborate with our technical team. Project Details: - Creation and/or modification of specific macros for process automation. - Integration of advanced SWOOD functions within SolidWorks. - Testing and adjustments to ensur...

We are looking for a skilled Shopify developer to create a professional and user-friendly Shopify website. The website will cater to a USA-based dropshipping business and will include 10 products and 5 pages. The developer should have experience in building Shopify stores, optimizing them for conversions, and integrating necessary tools and features for dropshipping. Key Responsibilities: Website Development: Design and develop a Shopify website that is visually appealing and responsive across all devices. Ensure the website has a clean, modern, and user-friendly layout. Product Setup: Add and organize 10 products, including product descriptions, high-quality images, pricing, and variants (if applicable). Optimize product listings for search and usability. Page Cre...

I need someone who is working on his own and ready to develop a mobile app in 4 5 hours using UI kits available online. Let me know if you can create a mobile app in 4 5 hours. I have the backend and api ready.

I need a dedicated backend developer well-versed in Laravel for a three-week project. The developer will be mainly focused on: - API Development - Database Management - Server-side Logic The developer will also need to integrate with our internal systems. Ideal candidates should have extensive experience in Laravel, API development, and server-side logic, as well as a solid understanding of database management. Familiarity with internal systems integration is a plus. Please be ready for a full-time commitment for the duration of the project.

I'm seeking a professional resume writer with experience in the UK job market, particularly for remote HR, admin, or secretarial roles. I have been applying for junior-level and entry level positions since last May, but despite having my CV redone multiple times, I've had no success. The job market is highly competitive, and I need a polished, tailored CV that stands out. Your expertise should include: Understanding of what recruiters value in the junior-level remote job market Ability to highlight my suitability for roles such as HR, Administrative Assistant, Executive Secretary, and Human Resources Experience with crafting resumes for the UK, Europe, American, and Middle East job markets. Open to adding more experience to CV if required to make m...

I need an experienced iOS developer to help convert my website into an iOS app. The primary aim of the app is to drive more traffic to my website. Key Features: - Push Notifications: I want to keep users engaged and informed about updates and new content on the website. - In-app Browser: This will allow users to navigate my website without leaving the app. Design: I have all the designs ready, so your role will primarily focus on development. The ideal candidate for this project should have: - Proven experience in iOS app development - Strong understanding of implementing push notifications - Experience with creating in-app browsers - Ability to work with existing design assets - Excellent problem-solving skills and attention to detail

I'm seeking an intermediate-level WordPress developer for immediate work. As an agency with numerous clients, we're looking for a long-term partnership. Your primary tasks will be both installing themes and editing content. Key Requirements: - Proficiency in WordPress with an intermediate level of expertise. - Experience with installing themes and editing content. - Availability for 20-30 hours per week, starting right away. - Ability to work independently. - Interest in a long-term partnership. Ideal Skills: - WordPress theme installation and customization. - Content editing and website maintenance. - Independent working capability. Compensation is hourly, between 20-30 hours per week.

The Medical Clinic Management System is an integrated solution designed to streamline administrative operations within a medical clinic. The system includes key components such as the admin, patients, and various staff members, including reception and registration clerks, financial officers, pharmacists, and the essential doctor. The system also manages medications, rooms, and clinic departments. It allows for tracking the patient service process from the reception stage to receiving their medication.

I am looking for a skilled developer to create a native tool designed for merchandisers in the fashion industry. This project involves building a React-based pop-up that provides basic market analysis to aid strategic decision-making. Below are the details: Scope of Work: 1. Develop a Pop-up Window: • Display a pop-up (600px x 600px) showing data for each establishment. • Exclude the shop_id field in the display. 2. Graphical Representations: • Integrate R[i] values into a PieChart. • Display the mean shop score (mean_shop[i]) next to its corresponding PieChart. 3. Time Series Graph: • Add a time series graph component with filtering capabilities: • Display sales results over time for all three stores combined. • Allow user...

I'm in need of a seasoned React developer to aid with the upgrade of my project to the latest version of React. The primary focus will be on component rewriting. Key Responsibilities: - Component Rewriting: I need assistance in rewriting components to be compatible with the upgraded version. Ideal Skills: - Proficient in React, , and JavaScript - Extensive experience with React 18 - Exceptional skills in component rewriting - Prior experience in performance optimization would be beneficial

We are seeking a skilled and experienced developer to design and build a Token Presale Dashboard for our upcoming token project presale. The ideal candidate will have a strong background in blockchain technology, user interface design, and secure payment integration. This dashboard will be the central platform for users to participate in the presale, monitor their token purchases, and manage their transactions. Key Responsibilities: • Develop and deploy a secure and user-friendly Token Presale Dashboard. • Integrate cryptocurrency wallet connectivity (e.g., MetaMask, Trust Wallet). • Enable real-time token price calculations and daily price adjustments. • Implement secure payment options for multiple cryptocurrencies and fiat currencies. • Prov...

I'm in need of a full-stack developer who is fluent in Swedish and has strong project management skills. The main focus is to develop a web application tailored for the Swedish market. Key requirements: - Fluent Swedish communication: This is crucial for understanding the market needs, communicating effectively, and ensuring the application resonates with Swedish users. - Full-stack development expertise: The developer should be capable of handling both the front-end and back-end of the web application. - Project management skills: While I will provide overall project direction, your expertise in managing project timelines, coordinating tasks, and ensuring quality control will be invaluable. Essential functionalities for the web application: - User...

Job Overview: We are looking for an experienced Objective-C iOS Native App Developer to update and maintain our existing iOS application. The app has already been developed, and we need your expertise to enhance its functionality, fix bugs, improve performance, and ensure compatibility with the latest iOS versions and devices. The ideal candidate should have a solid understanding of Objective-C, Xcode, and iOS development best practices. You will collaborate with our team to ensure the app remains stable, secure, and optimized for a seamless user experience. Key Responsibilities: Analyze the existing Objective-C codebase to understand the current app structure and functionality. Update the app to ensure compatibility with the latest iOS versions and Apple devices. Fix any bugs, c...

make frontend for my website made in cs and cshtml u basicly going to make the forntend in css cshtml and js only it wont be that ahrd and you have 1 day for 1 page its simple dm for more info and need to bve in css NO WORDPRESS NO AI NO NOTHING BE AN ACTUAL DEVELOPER

********************Over Budget & change price will be removed and rated.********************* I am looking for a proficient developer and UI designer with over 5 years of experience and a proven track record. I need payment integration for a system that does not have an SDK, so you must have strong coding skills to implement it into my app with all the required details. ********************Over Budget & change price will be removed and rated.********************* Issues to be fixed include: The currency symbol/logo is not appearing correctly. The live tracking of the delivery boy stops when the phone is locked. This needs to be resolved so that the tracking continues even when the phone is locked, as keeping the phone screen on continuously drains the battery quickly. ...

Seeking a highly experienced and dedicated software developer with extensive expertise in ReactJS, NodeJS/ NextJS, Django and MySql. The candidate will be responsible for creating a comprehensive e-commerce website within 40 days. The ideal candidate should have substantial experience in developing multiple combo offer pages like Buy1-Get1,Buy2-Get2 & Buy3-Get3 pages, gift card pages, gift pages, coupon pages, OTP verification, Abandoned cart notification, order notification and payment gateway integration. Key features include Dashboard management for pricing, bulk import/export, category management, enabling/disabling combo pages, creating gift cards with secure login pins similar to Myntra's setup, extensive admin panel capabilities like customer communicat...

...substantial experience in developing multiple combo offer pages like Buy1-Get1,Buy2-Get2 & Buy3-Get3 pages, gift card pages, gift pages, coupon pages(from admin pabel), OTP verification, Abandoned cart notification, order notification and payment gateway integration Note 99.9% website has to be managed through Dashboard, like editing pricing, bulk import,export,bulk move with-in pages, bulk edit, bulk delete, Hide category, in page pages or multiple pages, Edit in one page or multiple pages, though coded the website has to act plug and play Ecommerce Website USP - We give return gifts to customers based on Invoice size- hence the designs is detailed accordingly You need to first ensure that Gift cards with 16 digit or 12 digit secure login with pin code...

We are seeking an experienced and reliable mobile app developer to create a custom Android and iOS application with advanced features, including: - Object Detection & Classification: Identify and classify moving vehicles with real-time data processing. - Real-Time FTP Upload: Seamlessly upload recorded video clips and detected data to an FTP server. - Device Identification: Tag uploaded files with a unique device identifier. For complete project details, download the attached PDF.

...dizajn a funkčnosť nášho Shopify obchodu Implementovať a spravovať aplikácie a rozšírenia v rámci Shopify ekosystému. Zabezpečiť, aby bol e-shop plne optimalizovaný pre rýchlosť, SEO a mobilné zariadenia. Riešiť technické problémy a poskytovať podporu pri aktualizáciách a úpravách. Spolupracovať s naším tímom na implementácii dizajnov a obsahu. Požiadavky: Dokázateľná skúsenosť ako Shopify Developer s portfóliom vlastných projektov. Pokročilé znalosti HTML, CSS, JavaScript a Liquid . Skúsenosti s vývojom custom Shopify aplikácií. Znalosť API a Shopify App ekosyst&e...

I'm seeking an experienced imgui / GUI developer to design a control panel for a Windows-based desktop application. Key Responsibilities: - Create an intuitive and user-friendly control panel using imgui. - Ensure the GUI is responsive and efficient. - Collaborate with me to understand the application functionalities that need to be controlled via the panel. Ideal Skills and Experience: - Proficient in C++ and imgui. - Previous experience designing GUIs for desktop applications. - Strong understanding of control panel design and user experience. - Excellent communication skills for effective collaboration.

I'm seeking a professional with expertise in creating and developing online professional training courses. The primary delivery platform will be Zoom. Ideal Skills and Experience: - Proven track record in course development - Proficiency in using Zoom for course delivery - Experience in professional training - Excellent instructional design skills - Understanding of adult learning principles - Ability to create engaging and interactive content.

I'm in search of a proficient full stack developer who can create a comprehensive news website and mobile applications for both iOS and Android platforms. Key Features: - The platform should cater to both local and international news. - Core functionalities should include user login and registration, search functionality, and a commenting system. Ideal candidates should have: - Extensive experience in full stack development. - Prior work on news websites or similar platforms. - Proficiency in iOS and Android app development. - Ability to implement secure user registration and login systems. - Skills to integrate search functionalities and interactive commenting systems. Your expertise will help create an engaging and user-friendly news plat...

I'm looking for an RPA developer with extensive experience in Microsoft Power Automate Desktop or UIPath. The primary goal is to automate repetitive tasks that involve data entry and file/document management. The automation should specifically interact with Excel and our own in-house ERP system. Key Responsibilities: - Implementing RPA solutions using Microsoft Power Automate Desktop - Automating data entry and file/document management tasks - Ensuring smooth interaction with Excel and our in-house ERP Ideal Skills and Experience: - Proficiency in Microsoft Power Automate Desktop - Prior experience with automating data entry and file management tasks - Familiarity with Excel and ERP systems - Strong understanding of UI elements for effective automa...

I'm looking for an experienced programmer who can integrate APIs into a Telegram bot using PHP. The specific integration is with the SMS Active system to update prices in real-time. Key Requirements: - Expert in PHP programming language - Proven experience in developing and integrating APIs into Telegram bots - Familiarity with the SMS Active system - Ability to implement real-time price updates within the app Please note, the primary purpose of the bot is to update in-app prices based on real-time changes. Your bid will be considered if you can demonstrate relevant experience and skills.

I'm looking for a highly skilled backend developer to help me fix some issues on my existing Laravel website. The issues primarily pertain to database operations and API integrations. I have error logs and messages that can help pinpoint the bugs. Ideal skills and experience for the job include: - Proficiency in Laravel framework - Strong background in backend development - Experience handling database operations and API integrations - Ability to interpret error logs/messages - Problem-solving skills to fix bugs efficiently

My current application needs an experienced Expo developer who can help set up and test iOS universal links. In addition, the height of the tab bar needs to be reduced. Key Requirements: - Expertise in Expo and iOS application development - Experience with setting up and testing iOS universal links - Ability to modify UI components (specifically reducing tab bar height) - Understanding of Apple Developer Account functionalities I have an Apple Developer Account set up for universal links and I've also created the Apple App Site Association (AASA) file for it. But I need a professional to implement the fix and test the application accordingly.

Job Title: Website Developer Job Description: We are seeking a skilled Website Developer to enhance and manage our website. The primary focus will be adding a custom domain, improving the website's functionality, and ensuring it is optimized for user engagement. Key Responsibilities: 1. Domain Setup: Register and configure a custom domain for the website. Ensure seamless integration with hosting services. 2. Website Development and Improvement: Enhance the website's design and functionality to ensure a smooth user experience. Optimize the website for speed, mobile responsiveness, and SEO. Address any bugs or technical issues promptly. 3. Maintenance and Security: Perform regular updates to ensure the website runs smoothly. Implement best practices to...

I'm in need of a skilled frontend developer who specializes in Single-page Applications (SPAs). The project involves creating a frontend for an audio player. The ideal candidate for this project should have: - Strong proficiency in JavaScript and modern frontend frameworks (like React, Vue, or Angular) - Experience with developing SPAs - A good understanding of audio handling in web applications If you have a portfolio that includes similar projects, I'd love to see it!

I'm looking for an RPA developer with extensive experience in Microsoft Power Automate Desktop. The primary goal is to automate repetitive tasks that involve data entry and file/document management. The automation should specifically interact with Excel and our own in-house ERP system. Key Responsibilities: - Implementing RPA solutions using Microsoft Power Automate Desktop - Automating data entry and file/document management tasks - Ensuring smooth interaction with Excel and our in-house ERP Ideal Skills and Experience: - Proficiency in Microsoft Power Automate Desktop - Prior experience with automating data entry and file management tasks - Familiarity with Excel and ERP systems - Strong understanding of UI elements for effective automation

...experienced iOS automation professional to help set up and manage iPhone automation processes controlled via my Mac. The main task will involve setting up and automating account creation workflows for dating apps through a JB iPhone using automation tools. Key Requirements: • Expertise in Appium and other iOS automation frameworks/tools. • Familiarity with Mac-to-iPhone automation setups. • Strong understanding of iOS configurations, workflows, and device management. • Ability to demonstrate previous relevant work in iOS automation. • Knowledge of scripting languages (e.g., Python, JavaScript, Swift) for automation tasks. Responsibilities: • Set up robust and efficient iOS automation workflows. • Test and troubleshoot automation scripts...

I am in need of a web developer to assist me in creating a personal blog. The ideal candidate should be based in North America or Europe for time zone compatibility. Key Requirements: - New website development: The primary task will be to design and develop a new personal blog from scratch. - Commenting system: A key feature of the blog will be a robust commenting system, allowing readers to engage with the content. Ideal Skills and Experience: - Proficient in web development with a strong portfolio of website creations, particularly blogs. - Experience in implementing interactive features, such as a commenting system. - Strong communication skills for regular updates and discussions.

We’re seeking an experienced full-stack developer to build a web app that helps businesses manage customer communication across Facebook, Instagram, WhatsApp, and TikTok. The platform will enable account integrations, message management, and team collaboration. Key Features: User Authentication & Roles: Signup/login with email and password (cookie-based). Business owners can manage employees and assign access. Platform Integrations: Connect Facebook, Instagram, WhatsApp, and TikTok accounts. View and manage messages, comments, and posts. Employee activity tracking for sent messages. Dashboard: Centralized management for all connected accounts. Role-based functionality (owner vs. employee). Facebook Post Management: ...

AI/ML Developer for AIDexToken** **? Project:** AI/ML Developer for No-Code AI Blockchain Platform **? Industry:** Blockchain, Artificial Intelligence (AI), Web3 **? Job Type:** Freelance / Remote **? Budget:** Negotiable --- ### **Project Overview:** **AIDexToken (AIDEX)** is an innovative platform merging **Artificial Intelligence (AI)** with **blockchain technology**. Our mission is to democratize access to AI by providing a secure, scalable, and decentralized no-code environment where anyone can build, deploy, and monetize AI solutions. We are currently seeking a skilled **AI/ML Developer** to design, develop, and implement AI models that will power our no-code platform and seamlessly integrate with blockchain technology. --- ### **Responsibilitie...

I'm seeking a proficient Full Stack Developer to create a digital marketplace for me. The primary purpose of this project is to establish a robust and user-friendly e-commerce website. Key Features: - User Registration & Profiles: The site should allow users to create accounts, manage profiles, and track their activities. - Payment Gateway Integration: Secure and versatile payment options are crucial for this project. - Product Reviews & Ratings: A system for product reviews and ratings should be implemented to enhance user engagement and trust. and not limited to Ideal Skills and Experience: - Extensive experience in full stack development. - Proficiency in e-commerce website development. - Previous work with user registration systems, payment gateway...

PHP Regular work

...seeking a proficient mobile app and Google page developer for my kebab shop. The app should embody a modern, sleek design and encompass the following features: - Online Ordering: A user-friendly interface for customers to place orders seamlessly. - Loyalty Rewards Program: A system to keep our regular customers coming back. - Menu Display: An interactive and up-to-date presentation of our offerings. Moreover, the app needs to integrate smoothly with several third-party services: - Payment Gateways: Secure and efficient payment processing. - Social Media Platforms: Easy sharing and promoting of our app and shop. - Delivery Services: Coordinating with delivery partners for timely order dispatch. Ideal candidates should have extensive experience in app development, a soli...

I'm seeking an experienced PHP and JavaScript programmer to tailor a Codecanyon script to my needs. The modifications will focus primarily on the backend and involve incorporating a third-party payment gateway. Key Requirements: - Altering backend functionality to improve script performance - Integrating a third-party payment gateway seamlessly into the script - Prior experience with Codecanyon scripts is a plus The ideal candidate will be proficient in PHP and JavaScript, with a strong understanding of backend script functionality and API integrations. A knack for making user-friendly interface adjustments will also be appreciated. Please note, the primary task will be customizing the script's backend and facilitating payment gateway integration.