# Interface Mechanism 1 (IM1)

**Canonical:** https://apis.io/apis/tpp-systmone/im1-interface-mechanism-1/  
**Provider:** TPP (SystmOne) — https://apis.io/providers/tpp-systmone/  
**Documentation:** https://digital.nhs.uk/developer/api-catalogue/interface-mechanism-1-standards

Interface Mechanism 1 (IM1) is one of 6 APIs that [TPP (SystmOne)](https://apis.io/providers/tpp-systmone/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include IM1, National Health System, Interoperability, and EHR. The published artifact set on APIs.io includes API documentation and an API reference.

The NHS England national integration route by which approved third-party applications connect directly to GP clinical systems including TPP SystmOne. IM1 comprises the Transaction API (real-time read/write, e.g. appointment booking and structured record updates), the Bulk API (Strategic Reporting Extracts / aggregated data extraction), and the Patient Facing Services API. Onboarding is via the Digital Care Services IM1 Pairing Integration Process and a Supplier Conformance Assessment List (SCAL) approved by NHS England. Standards are published in the NHS England developer API catalogue, not on a TPP-hosted portal.

## Machine-readable artifacts (2)

- **Documentation** — https://digital.nhs.uk/services/digital-services-for-integrated-care/im1-pairing-integration
- **APIReference** — https://digital.nhs.uk/developer/api-catalogue/interface-mechanism-1-standards

## Other TPP (SystmOne) APIs (5)

- [SystmOne Client Integration API](https://apis.io/apis/tpp-systmone/systmone-client-integration-api/)
- [SystmOne Patient Facing Services (PFS) API](https://apis.io/apis/tpp-systmone/systmone-pfs-api/)
- [SystmOne Generic HTML API](https://apis.io/apis/tpp-systmone/systmone-generic-html-api/)
- [SystmOne Telephony API](https://apis.io/apis/tpp-systmone/systmone-telephony-api/)
- [GP Connect (FHIR)](https://apis.io/apis/tpp-systmone/gp-connect/)

## Tags

IM1, National Health System, Interoperability, EHR

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/tpp-systmone/im1-interface-mechanism-1/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/tpp-systmone/.