How to use data-raw json in body with RESTRequest?

[Ranja AZ 2]

Hello everyone,

Can someone help me to transform the following cURL request with use of TRESTClient and TRESTRequest:

 

curl --location --request POST 'https://<API server host>/auth/oauth2/token' 
-H 'Content-Type: application/json' 

-H 'Accepte: */*'
--data-raw '{
    "client_id": "013C1A93-3D33-4986-8A7C-773D02C26214",
    "client_secret": "FE8FBA46-6ABF-4DF1-8D5E-31345DAAD194",
    "grant_type": "client_credentials"
}'

 

Regards.

[Uwe Raabe 1888]

  var client := TRESTClient.Create('https://<API server host>/auth/oauth2/token');
  try
    var request := TRESTRequest.Create(nil);
    try
      request.Client := client;
      request.Accept := '*/*';
      request.AddBody(
       '{' +
        '"client_id": "013C1A93-3D33-4986-8A7C-773D02C26214",' +
        '"client_secret": "FE8FBA46-6ABF-4DF1-8D5E-31345DAAD194",' +
        '"grant_type": "client_credentials"' +
        '}', TRESTContentType.ctAPPLICATION_JSON);
      request.Execute;
      var response := request.Response;
      if response.Status.Success then
        HandleResponse(response.Content); // this has to be implemented by yourself
    finally
      request.Free;
    end;
  finally
    client.Free;
  end;

 

[Ranja AZ 2]

Hello Uwe Raabe,

 

Thanks for your response! I try it!

 

Regards

[Ranja AZ 2]

Uwe Raabe,

 

Thank you so much! It's work!

 

After Authorization, I have to execute payment with the following cURL:

 

curl --location --request POST 'https://<API server host>/merchant/v1/payments/'
--header 'Content-Type: application/json'
--header 'Authorization: bearer koeQidreesddfzsbxOXKjccccccc' \
--header 'X-Country: MG'
--header 'X-Currency: MGA'
--data-raw '{
    "reference": "Testing API",
    "subscriber": {
        "country": "MG",
        "currency": "MGA",
        "msisdn": 331170348
    },
    "transaction": {
        "amount": 1000,
        "country":"MG",
        "currency": "MGA",
        "id": "242EB08E-0ACD-445C-8FF7-320FFD85B4A4"
    }
}'

With Postman it's work with status 200. But with following code status is always 401

 

  var client := TRESTClient.Create('https://<API server host>/merchant/v1/payments/');
  try
    var request := TRESTRequest.Create(nil);
    try
      request.Client := client;
      request.Method := TRESTRequestMethod.rmPOST;
      request.Accept := '*/*';

      request.Params.AddItem;
      request.Params[0].Name := 'Autorization';
      request.Params[0].Value := 'bearer koeQidreesddfzsbxOXKjccccccc';
      request.Params[0].Kind := pkHTTPHEADER;

      request.Params.AddItem;
      request.Params[1].Name := 'X-Country';
      request.Params[1].Value := 'MG';
      request.Params[1].Kind := pkHTTPHEADER;

      request.Params.AddItem;
      request.Params[2].Name := 'X-Currency';
      request.Params[2].Value := 'MGA';
      request.Params[2].Kind := pkHTTPHEADER;

      request.AddBody('{"reference": "Testing API","subscriber": {"country": "MG", "currency": "MGA", "msisdn": 331170348}, "transaction": {"amount": 1000, "country":"MG", "currency": "MGA",    "id": "FE9833FE-D5A3-4450-9786-90735F75EBFB"}}', TRESTContentType.ctAPPLICATION_JSON);

      request.Execute;
      var response := request.Response;

 

Is there error in my code? 

 

Regard!

 

[Lars Fosdal 1732]

Are you missing the application/json content type?
Or is it an authentication issue - the 401 seems to indicate that.

[Ranja AZ 2]

by adding the following lines

 

      request.Params.AddItem;
      request.Params[3].Name := 'Content-Type';
      request.Params[3].Value := 'application/json';
      request.Params[3].Kind := pkHTTPHEADER;

 

result is the same: status 401

[Ranja AZ 2]

Before calling "payments" API, I called another API using the same token access: token work fine! 

[Uwe Raabe 1888]

You spelled Authorization wrong.

Quote

request.Params[0].Name := 'Autorization';

Have you considered using a TOAuth2Authenticator instance linked to the client?

 

 var client := TRESTClient.Create('https://<API server host>/merchant/v1/payments/');
 try
   var auth := TOAuth2Authenticator.Create(client); // the client will free the authenticator
   auth.TokenType := TOAuth2TokenType.ttBEARER;
   auth.AccessToken := 'koeQidreesddfzsbxOXKjccccccc';
   client.Authenticator := auth;
   var request := TRESTRequest.Create(nil);

Adding the header parameters can also be simplified:

    request.AddParameter('X-Country', 'MG', pkHTTPHEADER);
    request.AddParameter('X-Currency', 'MGA', pkHTTPHEADER);

 

[Ranja AZ 2]

You are right about Authorization!

[Ranja AZ 2]

I show you what I do in Postman. May be help.

 

[vfbb 275]

You can try with refit unit https://github.com/viniciusfbb/ipub-refit

The implementation could be something like this:

 

unit MerchantApi;

interface

uses
  iPub.Rtl.Refit; // https://github.com/viniciusfbb/ipub-refit

type
  TCountry = (MG);
  TCurrency = (MGA);

  TPaymentSubscriber = record
    Country: TCountry;
    Currency: TCurrency;
    Msisdn: Cardinal;
  end;

  TPaymentTransaction = record
    Amount: Integer;
    Country: TCountry;
    Currency: TCurrency;
    Id: string;
  end;

  TPaymentRequest = record
    Reference: string;
    Subscriber: TPaymentSubscriber;
    Transaction: TPaymentTransaction;
  end;

  [BaseUrl('https://API_server_host/merchant/v1')]
  IMerchantApi = interface(IipRestApi)
    ['{1D10C463-1567-4DE0-88F2-099CC0442E43}']

    [Post('/payments')]
    [Headers('Authorization', 'Bearer {AuthToken}')]
    [Headers('X-Country', '{XCountry}')]
    [Headers('X-Currency', '{XCurrency}')]
    function Payments(AXCountry: TCountry; AXCurrency: TCurrency; const ABody: TPaymentRequest): string;

    function GetAuthToken: string;
    procedure SetAuthToken(const AValue: string);
    property AuthToken: string read GetAuthToken write SetAuthToken;
  end;

var
  FMerchantApi: IMerchantApi;

implementation

initialization
  FMerchantApi := GRestService.&For<IMerchantApi>;
end.

 

And your code could be this:

 

 

uses
  MerchantApi;

procedure TForm1.FormCreate(Sender: TObject);
var
  LPaymentRequest: TPaymentRequest;
begin
  LPaymentRequest.Reference := 'Testing API';
  LPaymentRequest.Subscriber.Country := TCountry.MG;
  LPaymentRequest.Subscriber.Currency := TCurrency.MGA;
  LPaymentRequest.Subscriber.Msisdn := 331170348;
  LPaymentRequest.Transaction.Amount := 1000;
  LPaymentRequest.Transaction.Country := TCountry.MG;
  LPaymentRequest.Transaction.Currency := TCurrency.MGA;
  LPaymentRequest.Transaction.Id := 'FE9833FE-D5A3-4450-9786-90735F75EBFB';

  FMerchantApi.AuthToken := 'koeQidreesddfzsbxOXKjccccccc';
  ShowMessage(FMerchantApi.Payments(TCountry.MG, TCurrency.MGA, LPaymentRequest));
end;

 

[Ranja AZ 2]

I Try to test it with REST Debugger: same result.

[Uwe Raabe 1888]

Looks like you didn't check the Do Not Encode for the parameters.

 

When using the Bearer Authenticator this is handled internally. If you want to add the parameter manually you can do like this:

        request.AddAuthParameter(HTTP_HEADERFIELD_AUTH, 'Bearer ' + <YourAccessToken>,
          TRESTRequestParameterKind.pkHTTPHEADER, [TRESTRequestParameterOption.poDoNotEncode]);

The HTTP_HEADERFIELD_AUTH is declared in REST.Consts.pas.

[Ranja AZ 2]

Hello everyone!

Following all your instructions, everything is OK now.

Many thanks to all of you!