SaaS API Integration Service — Connect Any Third-Party Service to Your Platform | £997–£4,997 | By Design UK

Your SaaS platform is live but you need to connect it to a third-party service — Stripe, Twilio, HubSpot, OpenAI, Google Workspace, Slack or any other API. We build the integration cleanly, securely and with proper error handling so it works reliably in production.

✅ What's Included

• 🔗 Single API Integration — One complete end-to-end integration built, tested and deployed — from connection through to webhook handling and error recovery
• 🔐 Secure Implementation — API keys stored as environment variables, no hardcoded credentials, proper authentication flow
• ⚡ Webhook Handling — Incoming webhook processing built with signature verification, retry logic and failure alerting
• 🔄 Error Handling — Comprehensive error handling — graceful failures, user feedback, admin notifications, automatic retries where appropriate
• 📋 Documentation — Integration documented with setup guide, environment variable list and operational notes
• 🧪 Full Testing — Unit tests and integration tests written and passing before deployment
• 🚀 Deployment — Integration deployed to your production environment and verified working end-to-end
• 🔧 14-Day Post-Integration Support — Any issues with the integration in the first 14 days resolved at no additional cost
• 📊 Popular Integrations — Stripe, Twilio, PureSMS, WhatsApp Business, HubSpot, Salesforce, OpenAI, Claude API, Google Workspace, Zapier, Slack, Xero, QuickBooks and more