Troubleshooting

Check that template matches the key in your project, the requested language is published, and every variable is supplied. Use the field names in errors to find invalid data. Line item rows require name, quantity, and amount.

Retrieve the message by ID. simulated means sandbox mode is enabled. For live delivery, check Sending setup, workspace Billing, and email activity. delivered confirms the recipient server accepted the email; check the recipient’s spam folder too.

Check that retries use the original idempotency key and unchanged payload. A new key creates a new email.

For 401, confirm the server has an active API key. For 404 when retrieving an email, confirm the key belongs to the project that sent it.