We are looking for an experienced automation specialist to quickly implement a reliable onboarding workflow connecting Stripe, Make (Integromat), and Google Sheets. This project is time-sensitive. We expect fast execution, and any bid submitted is considered a commitment to deliver within the agreed timeframe. System Overview: Payment Gateway: Stripe Automation Platform: Make Database: Google Sheets (already structured) Email Provider: Infomaniak Main Objective: When a payment is successfully completed on Stripe, the system should: Detect the payment Retrieve customer data Assign a postal box number (only for specific offers) Store the client in Google Sheets Send a personalized email with their postal address Workflow Details: Stripe Trigger (we provide account access) Event: checkout.session.completed Extract: Customer email Full name (first + last) Product type (Starter or Domiciliation via metadata) Conditional Logic (Router) A. Starter Offer: Retrieve the first available number from Google Sheets (status = FREE) Mark it as USED immediately (to prevent duplication) Assign it to the client Save client data in "CLIENTS" sheet B. Domiciliation Offer: No number assignment Save client directly in "CLIENTS" sheet Google Sheets Structure (already set up): Sheet "NUMBERS": pool of available postal box numbers Sheet "CLIENTS": customer database Email Automation: Send a confirmation email via Infomaniak including: Full postal address Assigned number (if Starter) Link to upload ID documents Send to: Customer Admin (cc) Business Logic Requirements: Numbers must be assigned sequentially and never duplicated The system must handle concurrent payments safely (important) Only confirmed Stripe payments should trigger the workflow Deadline & Commitment: Project must be delivered quickly (please specify your timeline when bidding) Only apply if you can start immediately Your bid is a commitment to deliver — no delays, no scope drift Expected Deliverables: Fully functional Make scenario Clean and maintainable structure Proper error handling Short documentation or walkthrough Ideal Profile: Strong experience with Make (Integromat) Experience with Stripe integrations Comfortable using Google Sheets as a database Detail-oriented and reliable