FreshBooks and GPSWOX Automation System

Hi, I’m looking for a developer to build a small automation system connecting FreshBooks and GPSWOX. Here is the goal: • My clients receive monthly invoices via FreshBooks (recurring invoices) • They pay through the FreshBooks invoice link • After payment is completed, the system should automatically update their access in GPSWOX IMPORTANT BUSINESS LOGIC: Clients are on a 1-year contract. If they miss payments, they must pay ALL outstanding months before access is restored. So the system must: Check total outstanding balance (not just one invoice) Only reactivate/extend access when FULL balance is paid PAYMENT SETUP: • FreshBooks payment methods must also be configured (Stripe / PayPal / credit card) • Clients should be able to pay directly from the invoice • Please set up and connect the payment gateway correctly TECHNICAL REQUIREMENTS: • Use FreshBooks API or webhook to detect when an invoice is paid • Build a small backend (Node.js, PHP, etc.) • Connect to GPSWOX API (update-client or correct endpoint) • Update user/device access (reactivate / extend plan / expiration) • Map FreshBooks clients to GPSWOX users NICE TO HAVE: • Simple dashboard/log to track payments and actions • Error handling if API fails Please let me know: Your experience with APIs/webhooks Which stack you recommend Estimated time to complete I want something simple, reliable, and fully automated. Thank you.