Migrate from Resend

Postwave's API uses the same paths, payloads and errors, so your existing code works unchanged.

1. Add and verify your domain in Postwave (guide).
2. Create an API key.
3. Set the base URL and swap the key:

RESEND_BASE_URL=https://postwaves.online      # Node, PHP, Ruby, Go
RESEND_API_URL=https://postwaves.online       # Python
RESEND_API_KEY=pw_xxxxxxxxx

4. Point your webhook endpoints at Postwave (signatures use the same Svix format).