activitypub-integrations

To add custom post type support to ActivityPub, register the post type via the `activitypub_supported_post_types` filter, then attach a transformer using hooks to map your post data to ActivityPub activity objects. This enables federation and content sharing across the ActivityPub network.

Yes. ActivityPub integrates with WooCommerce, BuddyPress, bbPress, Jetpack, The Events Calendar, and WP User Avatars through plugin-specific transformers and ActivityPub hooks. Each integration follows patterns for detecting active plugins, registering custom types, and modifying activity objects.

Debug compatibility by verifying integration loading via hook inspection, testing post type registration, checking plugin detection logic, and validating hook priority. Common issues stem from incorrect filter application or missing plugin availability checks before hooking into ActivityPub.

Yes. Always check plugin status before applying ActivityPub hooks to avoid fatal errors. Use standard WordPress functions to verify the target plugin is active, then conditionally register transformers and attach filters only when dependencies are present.

Modify activity objects using ActivityPub filters to transform custom post data into federated format. Attach transformers that map your plugin's content structure to ActivityPub properties, ensuring proper federation and compatibility with remote platforms.

When an integrated plugin deactivates, its custom post types should gracefully deregister from ActivityPub to prevent orphaned or misconfigured activities. Design integrations to clean up hooks and transformers during deactivation to maintain federation integrity.