Sync contacts with the API
Connect your CRM, website or previous email provider with an API key.
The Sendonia API keeps your contacts and lists in sync with your other systems, such as SendGrid, Brevo, your CRM or your website's sign-up form.
- 1Open API keys in your workspace. Owners and admins can create keys.
- 2Select Create API key, name it and choose its access: read only, or read and write.
- 3Copy the key straight away. It is shown only once.
- 4Send it with every request in the Authorization header: Bearer followed by your key.
Syncing contacts
- Send up to 1,000 contacts per request to the batch endpoint. Contacts are matched by email, so you can repeat a sync safely.
- Mark people who unsubscribed at your previous provider as unsubscribed, so they never receive your campaigns.
- An unsubscribed or suppressed contact is never subscribed again by a sync.
- Contacts over your plan’s contact limit are reported back and not created.
Good to know
The API works once your workspace is approved and on a paid plan. Each workspace can make 120 requests a minute. The full API reference is at https://sendonia.com/docs/api.
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