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Connect the last mile.

Webhooks, transactional email and domains are operational integrations. Verify signatures, use a sending domain, handle retries and test DNS from the public internet before calling the project live.

APIs and Deploy · 8 min read · Updated 2026-06-06

Webhooks

A few moving parts are involved here. The points below cover each of them, so you can see the full scope before deciding where to start.

  • Verify the provider signature before parsing business events.
  • Reject stale or duplicated event IDs or process them idempotently.
  • Return a fast acknowledgement and move slow work to a function or queue.
  • Log a correlation ID without logging secrets or full personal payloads.

Transactional email

Use a verified From domain, a clear Reply-To and branded templates. Monitor accepted, delivered, bounced and suppressed states. Keep the database submission even if notification delivery needs a retry.

Domain and SSL steps

Here is the process broken into clear steps. Take them one at a time and check each off before moving on.

  1. Add the domain in the hosting or app settings.
  2. Create the exact DNS records provided by the platform.
  3. Wait for DNS propagation and verify the final host.
  4. Open both HTTP and HTTPS versions and confirm the preferred redirect.
  5. Test OAuth, webhooks, sitemap and canonical URLs on the final origin.
Do not paste private provider tokens into a client component or commit them to GitHub. Rotate a secret immediately if it was exposed.

DNS record checklist

This comes down to a handful of concrete details. Work through the list below and flag the ones you have not covered yet.

  • SPF record includes the sending provider and no conflicting duplicate SPF lines.
  • DKIM records match exactly what the email provider issued.
  • DMARC policy is set, even a monitoring-only policy, rather than left absent.
  • A record or CNAME for the app domain points at the correct hosting target.
  • Old records from a previous provider are removed, not just left alongside new ones.

Signs an integration is misconfigured

Use the list below as a working checklist. Each item is something you can verify or action directly on your own site.

  • Emails land in spam despite showing as delivered by the provider.
  • A webhook handler processes the same event more than once, creating duplicate records.
  • The domain works over HTTP but shows a certificate warning over HTTPS.
  • OAuth callbacks fail only on the custom domain, not on the preview URL.

Questions

Usually a missing or misconfigured SPF, DKIM or DMARC record for the sending domain. Verify all three are published and match exactly what the email provider issued, then check spam placement again after propagation.

Often minutes, sometimes up to 48 hours depending on the record type and previous TTL settings. Test with a DNS lookup tool from outside your own network before assuming it has failed.

The production endpoint often has a different signing secret, a stricter timeout, or is blocked by an authentication rule meant for regular users. Confirm the webhook route is public and uses the live signing secret.

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