Use an API key with the scope: contacts.readonly. Keep credentials secure, rotate keys regularly, and limit access to trusted systems.
Create and configure your MailerSend API key, enable necessary webhooks, and set the correct base URL for the Contacts API to ensure secure, reliable data sync.
– GET /contacts/:contactId – GET /contacts/:contactId/tasks – GET /contacts/:contactId/tasks/:taskId – GET /contacts/:contactId/notes – GET /contacts/:contactId/notes/:id – GET /contacts/:contactId/appointments – GET /contacts/ – GET /contacts/business/:businessId – contacts.write – POST /contacts/ – PUT /contacts/:contactId – DELETE /contacts/:contactId – POST /contacts/:contactId/tasks – PUT /contacts/:contactId/tasks/:taskId – PUT /contacts/:contactId/tasks/:taskId/completed – DELETE /contacts/:contactId/tasks/:taskId – POST /contacts/:contactId/tags
Trigger: When a contact is created or updated in MailerSend, fetch the latest profile data from the Contacts API.
Actions: Call GET /contacts/:contactId, map fields (name, email, phone) back to MailerSend, and update the contact record.
GET /contacts/:contactId
contactId, firstName, lastName, email, phone
Trigger: When a contact reaches a milestone, trigger a follow-up action in MailerSend.
Actions: POST /contacts/:contactId/tasks to create a follow-up task with due date and title.
POST /contacts/:contactId/tasks
contactId, title, dueDate, status
Trigger: When a contact’s lifecycle stage changes, apply or update tags in the Contacts API.
Actions: POST /contacts/:contactId/tags to assign relevant tags for segmentation.
POST /contacts/:contactId/tags
contactId, tag
No coding required — build automations in MailerSend while data stays synchronized with the Contacts API.
Faster onboarding for new contacts with automatic data enrichment and updates.
Improved data accuracy across campaigns and workflows with real-time sync.
This section defines essential terms and the core data processes used when connecting MailerSend to the Contacts API.
A secret token used to authenticate requests to the Contacts API from MailerSend.
A specific URL path in the API that enables a defined action, such as retrieving a contact or creating a task.
A mechanism for receiving real-time events from the Contacts API into MailerSend.
Permissions granted to an API key, determining which resources can be read or modified.
Capture new leads in MailerSend and automatically populate the Contacts API record with basic fields.
Link tasks completed in the Contacts API to campaign progress in MailerSend to trigger follow-up emails.
Apply tags from the Contacts API to MailerSend campaigns to tailor content.
Create an API key in Contacts API, grant the necessary scope, and securely add it to MailerSend.
Map contact fields in MailerSend to the corresponding fields in the Contacts API, ensuring name, email, and tags sync correctly.
Run tests, verify data flow, and enable live automations across campaigns and workflows.
Authenticate requests by using a valid API key with the correct scope (contacts.readonly). Store keys securely and never expose them in client-side code. Rotate keys periodically and monitor for unusual activity. If you use webhooks, validate signatures to ensure events originate from the Contacts API. In MailerSend, securely reference the key in server-side configurations and use environment variables to protect sensitive data.
The required scope to read contact data is contacts.readonly. If you need to modify contacts, you may require additional scopes defined by the API. Always grant the minimum scope necessary for the task to reduce risk. Keep scopes aligned with your automation use cases.
To fetch a contact and its tasks, start with GET /contacts/:contactId to retrieve the contact, then use GET /contacts/:contactId/tasks to pull related tasks. This keeps data synchronized and lets you drive campaigns from up-to-date task status. For notes or appointments, use the corresponding endpoints listed in the endpoint catalog.
Most API providers enforce rate limits. Implement exponential backoff and retry logic, and cache non-critical data when possible. If you approach the limit, stagger requests and consider batching when the API supports it. Monitor your quota via the API dashboard and adjust your automation cadence accordingly.
Yes. MailerSend can create and update contact records via POST /contacts/ and PUT /contacts/:contactId. Ensure your API key has the appropriate write scope. Map fields carefully to avoid overwriting important data, and validate responses before proceeding with subsequent actions.
Webhooks are supported to push real-time events into MailerSend. Configure webhooks to receive events like contact updates, task changes, or tag updates. Validate payload signatures on receipt to confirm authenticity and apply idempotent processing to avoid duplicate actions.
Security best practices include using server-side environment variables for keys, rotating credentials, enabling IP allowlists, and auditing access logs. Use least-privilege principles for API keys and implement error handling that does not leak sensitive data. Regularly review permissions and access.
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Complete Operations Catalog - 126 Actions & Triggers
