IAV-1036 : prevent duplicate credit application on subscription checkout (!29) · Requêtes de fusion · iavia / iavia-credit-service · GitLab

saoud marouane a demandé de fusionner feature/IAV-1036 vers develop fév. 24, 2026

Remove credit accumulation from checkout.session.completed webhook
Apply credits exclusively via invoice.payment_succeeded webhook
Credits now applied exactly once when payment is confirmed
Handle free trial exit in both webhook handlers (idempotent)
Maintain webhook order resilience

Fixes: Credits being applied twice (checkout + invoice webhooks)

Closes IAV-1036