> For the complete documentation index, see [llms.txt](https://docs.welkinhealth.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference.md).

# API Reference

- [Patients](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/patients.md)
- [CDT Formation](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/cdt-formation.md): Read Custom Data Type (CDT) schema definitions configured in Welkin Designer.
- [Custom Data Types (CDT)](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/custom-data-types.md): Create, read, update, and delete Custom Data Type (CDT) record instances.
- [Profile Formation](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/profile-formation.md): Read Profile Data Type (PDT) schema definitions.
- [Profile Records](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/profile-records.md): Create, read, update, and delete patient profile data records.
- [Contacts](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/contacts.md): Manage contacts associated with patients, such as family members and caregivers.
- [Encounters](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/encounters.md)
- [Users](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/users.md): Manage care team users, territories, regions, and security policies.
- [Assessment Formation](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/assessment-formation.md): Read assessment schema definitions configured in Welkin Designer.
- [Assessment Records](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/assessment-records.md): Create and manage patient assessment responses.
- [Calls](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/calls.md): Access voice call records and download call recordings.
- [SMS](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/sms.md): Access SMS message records and attachments for patients.
- [Email](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/email.md): Access email records, drafts, and attachments for patients.
- [Fax](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/fax.md): Send and receive faxes, manage fax drafts, and assign faxes to patient records.
- [Chat / History](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/chat-history.md): Send and retrieve in-app chat messages between patients and care teams.
- [Care Plan](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/care-plan.md): Read patient care plans and associated goals.
- [Calendar](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/calendar.md): Manage calendar events, working hours, and appointment schedules.
- [Programs](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/programs.md): Read program definitions and manage patient program enrollment.
- [Task Management](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/task-management.md)
- [Patient Programs](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/patient-programs.md): Enroll patients in programs and manage their phase progression.
- [Dictionaries](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/dictionaries.md)
- [Audit](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/audit.md)
- [Export](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/export.md): Bulk export records across all major resource types using the Export API.
- [Document Types](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/document-types.md)
- [Documents](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/documents.md)
- [Unrecognized Calls](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/unrecognized-calls.md)
- [Unrecognized SMS](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/unrecognized-sms.md)
- [Unrecognized Emails](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/unrecognized-emails.md)
- [Payments & Subscriptions](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/payments.md)
- [Invoices](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/invoices.md): Retrieve patient invoice records by patient, encounter, or invoice ID.
- [Communication API](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/communication-api.md)
- [Messaging Templates](https://docs.welkinhealth.com/developer-and-integration-guide/api-reference/messaging-templates.md)


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