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6/18/2024

Automating SaaS upgrades with Creem webhooks

How we wired Creem Checkout, Next.js API routes, and Supabase to unlock plans seconds after payment.

Every indie SaaS faces two challenges when charging for features:

  1. Accept payments without building a full billing system.
  2. Activate features instantly after checkout.

Creem solved both for us:

  • Checkout links can be generated on the fly with metadata.
  • Webhooks cover checkout.completed and subscription.paid.
  • Metadata carries our Supabase user ID, so we can update plan_status immediately.

In AI Image Describer we expose POST /api/payments/creem-session to create a checkout, then /api/webhooks/creem validates the signature and upgrades the user to pro. Less than 200 lines of code = fully automated billing.

If you’re building tools similar to imagetotext.io, connect payments to your auth layer early so you can keep iterating on product value instead of manual ops.