# Mutations
URL: https://docs.awellhealth.com/api-reference/guides/mutations

> For the complete documentation index, see [llms.txt](https://docs.awellhealth.com/llms.txt).



Queries read data; **mutations** change it. Use mutations to create and update patients, start
and stop care flows, submit activities, and retry failed integrations. This page orients you to
what's available and where to find it.

Mutations are grouped with their domain in the **Reference** section. The main write operations:

| Domain                                                                  | Examples                                                                      |
| ----------------------------------------------------------------------- | ----------------------------------------------------------------------------- |
| [Patients](/api-reference/reference/patients)                           | `createPatient`, `updatePatient`, `mergePatients`, `setPatientDataPointValue` |
| [Care flows](/api-reference/reference/care-flows)                       | `startPathway`, `stopPathway`, `pauseCareFlow`, `completeCareflow`            |
| [Activities](/api-reference/reference/activities)                       | `retryActivity`, `expireActivity`, `completeExtensionActivity`                |
| [Activity types](/api-reference/reference/activity-types)               | `submitFormResponse`, `submitChecklist`, `markMessageAsRead`                  |
| [Tracks](/api-reference/reference/tracks)                               | `addTrack`, `scheduleTrack`, `stopTrack`                                      |
| [Hosted sessions & pages](/api-reference/reference/hosted-sessions)     | `startHostedPathwaySession`, `completeSession`                                |
| [API calls & webhooks](/api-reference/reference/api-calls-and-webhooks) | `retryApiCall`, `retryWebhookCall`                                            |

Every mutation returns a payload with a `code` and `success` field — see
[Errors](/api-reference/guides/errors) for how to read them.

## Related [#related]

* [Getting started](/api-reference/guides/getting-started)
* Browse the full write API under **Reference**.