# ActivityDefinition ## Get FHIR r4 activity definitions - [GET /site/{siteId}/fhir/activity-definition](https://docs.heydonto.com/apis/fhir/openapi/activitydefinition/fhiractivitydefinitioncontroller_getactivitydefinitions.md) ## Create FHIR r4 activity definition - [POST /site/{siteId}/fhir/activity-definition](https://docs.heydonto.com/apis/fhir/openapi/activitydefinition/fhiractivitydefinitioncontroller_createactivitydefinition.md) ## Get FHIR r4 activity definition by ID - [GET /site/{siteId}/fhir/activity-definition/{id}](https://docs.heydonto.com/apis/fhir/openapi/activitydefinition/fhiractivitydefinitioncontroller_getactivitydefinition.md) ## Update FHIR r4 activity definition - [PUT /site/{siteId}/fhir/activity-definition/{id}](https://docs.heydonto.com/apis/fhir/openapi/activitydefinition/fhiractivitydefinitioncontroller_updateactivitydefinition.md) ## Delete FHIR r4 activity definition - [DELETE /site/{siteId}/fhir/activity-definition/{id}](https://docs.heydonto.com/apis/fhir/openapi/activitydefinition/fhiractivitydefinitioncontroller_deleteactivitydefinition.md) ## Get FHIR r4 activity definition history by ID - [GET /site/{siteId}/fhir/activity-definition/{id}/history](https://docs.heydonto.com/apis/fhir/openapi/activitydefinition/fhiractivitydefinitioncontroller_getactivitydefinitionhistory.md)