How to connect WordPress to external apps

First decide whether the external app needs to read or change WordPress, whether WordPress needs to send data to the app, or whether you need both directions. The WordPress REST API exposes content as JSON and supports remote HTTP requests, so it is the normal starting point for app connections.

For a single, simple transfer, a small custom integration can be fine. If you need several triggers, field mappings, retries, logs or non-technical users to manage the workflow, plan to use an integration plugin instead.

In the external app’s documentation, identify its API endpoint, required data fields, authentication method and rate limits. Decide what should happen when a request fails and whether the app accepts incoming webhooks.

Do not guess field names or endpoint URLs. A successful connection can still create incomplete records if the external service expects a different date format, status value or email field.

If the external app must access private WordPress data, create an application password from Users, open the account that will be used, and add a new application password. WordPress introduced application passwords in version 5.6; they are intended for API authentication, are displayed only when created, and can be revoked separately from the user’s main password. Use HTTPS and store the value in the external app’s secure credential field.

Use a dedicated user with only the capabilities the connection needs. Never put the site owner’s normal password in an integration, and do not paste an application password into public code, screenshots or support posts.

For app-to-WordPress access, give the service the site’s REST API base, usually beginning with https://example.com/wp-json/, together with the WordPress username and application password. The exact route depends on the data: posts, pages, media and other built-in resources have documented REST routes. Test a read request before allowing create, update or delete actions.

For WordPress-to-app delivery, a developer normally adds a small custom plugin or site-specific integration that sends a POST request to the external service. WordPress provides wp_remote_post() and response helpers for this; the integration should check the response code, record failures and avoid sending sensitive data unnecessarily.

Run the workflow with test data and verify the result in both systems. Check text, dates, IDs, HTML, attachments and duplicate handling. Then test a failed request by using an invalid credential or temporarily unavailable endpoint, and confirm that the failure is visible rather than silently lost.

The common Friday failure is a security plugin, host firewall or caching layer blocking /wp-json/, the authorisation header or a webhook route. A 401 usually points to missing or invalid authentication; a 403 usually means the authenticated account lacks permission or another security rule is refusing the request. Check the server and plugin logs before changing code.

For the fast route, install and activate Bit Integrations Pro, then create a workflow with a WordPress trigger, the external app action and any field mappings or conditions. It is suited to no-code connections with services such as Google Sheets, Zapier and Mailchimp, and can also work with webhooks.

This route is preferable when you need several app connections, reusable triggers and actions, or an interface that someone else can maintain. Keep the manual REST API route for one small, stable integration where you control the code and are prepared to maintain authentication and error handling.