Myujth

I am trying to use the Delphi TREST components to connect to the HRMC VAT API.

I have got as far as obtaining access and refresh tokens, but I cannot get any further.

At the moment, I am trying to retrieve my obligations as follows:-

RESTClient := TRestClient.Create('https://test-api.service.hmrc.gov.uk/organisations/vat/666596898/obligations');
try
 RESTRequest := TRESTRequest.Create(RESTClient);
 RESTResponse := TRESTResponse.Create(RESTClient);
 OAuth2 := TOAuth2Authenticator.Create(RESTClient);

 with OAuth2 do
 begin
 AccessToken := <my access token>;
 ResponseType := TOAuth2ResponseType(rtCODE);
 TokenType := TOAuth2TokenType(ttBEARER);
 end;

 with RESTClient do
 begin
 Authenticator := OAuth2;
 ContentType := 'application/json';
 end;

 with RESTRequest do
 begin
 Client := RESTClient;
 Response := RESTResponse;
 Accept := 'application/vnd.hmrc.1.0+json';
 Params.AddItem('from', '2017-01-25', pkGETorPOST);
 Params.AddItem('to', '2017-01-25', pkGETorPOST);
 Execute;
 end;

 finally
 RESTClient.DisposeOf;
 end;

This particular code returns the error INVALID_DATE_RANGE. But depending on what dates I use, I also sometimes get CLIENT_OR_AGENT_NOT_AUTHORISED.

Can anyone shed any light on where I am going wrong?

Perhaps it doesn't like the start and end dates being the same? It does say invalid date RANGE rather than invalid dates.

I worked it out finally. It was a problem with my Test User credentials. I generated them from the HMRC website, but I discovered from other posts that there is a problem generating them that way. When I created a user via the API, it works fine!

I hope this helps someone.