I believe it’s https://192.168.128.11/messageexchange but haven’t had time to check.
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Did you get an answer to the original question.
The API documentation has moved to Message Exchange for Social Care and Health (MESH) API - NHS Digital
Slightly different problem
I can call the opentest version of lookup with no issues
https://192.168.128.11/endpointlookup/mesh/SCREEN2/SPINE_GPCAPITATION_EXTRACT
However when I try to do an inbox query
https://192.168.128.11/messageexchange/Y90638OT002/inbox
I get 403 error.
I’m presuming I have got something wrong with my Authorization header (as both spine and mesh certs appear to be ok with the endpointlookup call)
Presume the HMACSECRETKEY is always ‘BackBone’?
I think my error is around this:
Is the hmac_msg in this call base64 encoded, some NEMS documentation seems to indicate it is?
UPDATE
Was a problem with how I was build the hash
public static String getHash(String data, String key)
{
String algorithm = "HmacSHA256";
try {
SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), algorithm);
Mac mac = Mac.getInstance(algorithm);
mac.init(secretKeySpec);
byte[] result = mac.doFinal(data.getBytes());
return Hex.encodeHexString(result);
}
catch (Exception ex) {
return ex.getMessage();
}
}
I found this on github which I found a lot clearer to understand 
integration-adaptor-nhais/mesh.sh at develop · nhsconnect/integration-adaptor-nhais · GitHub