Filemaker to Xero OAuth2 Update

My current Filemaker to Xero integration needs an update. The connection should support exporting invoices and adding sales analysis code. The access token has expired and is not refreshing. Performance issues are impacting the efficacy of the integration. Ideal Candidates Should Have: - Extensive experience with Filemaker and Xero integrations - Familiarity with OAuth2 protocols - Problem-solving skills for troubleshooting connection issues - Ability to implement necessary changes for performance improvement I would also like them to add a 'Sales Analysis' field within my Datafile stock items and then have this sales data transfer to Xero with the associated invoices so i can analyze the data in Xero.