Where can I find documentation on SSP?
The Spine Secure Proxy (SSP) is a separate product to NRL (the National Record Locator) that is looked after by a separate team. The National Record Locator Service is an index of pointers that can point you to where a record is held. SSP is one retrieval mechanism that can be used to subsequently retrieve those records from source. Guidance on use of SSP with NRL can be found here: https://developer.nhs.uk/apis/nrl/retrieval_ssp.html