Basta scrivere a mano i client REST

uses
  sgcOpenAPI_Parser, sgcOpenAPI_Generator;
var
  vParser: TsgcOpenAPIParser;
  vGen: TsgcOpenAPIGenerator;
begin
  vParser := TsgcOpenAPIParser.Create(nil);
  try
    vParser.LoadFromFile('C:\specs\github\api.github.com.json');
    Memo1.Lines.Add(Format('GitHub spec: %d paths, %d schemas',
      [vParser.Paths.Count, vParser.Schemas.Count]));

    vGen := TsgcOpenAPIGenerator.Create(nil);
    try
      vGen.Parser := vParser;
      vGen.OutputUnit := 'sgcOpenAPI_GitHub';
      vGen.OutputFolder := 'C:\Generated\GitHub';
      vGen.GroupBy := gbTag;        // one class per tag
      vGen.Generate;
    finally
      vGen.Free;
    end;
  finally
    vParser.Free;
  end;
end;

uses
  sgcOpenAPI_PetStore;  // Generated from petstore.yaml

procedure TForm1.btnGetPetClick(Sender: TObject);
var
  Client: TsgcOpenAPI_PetStoreClient;
  Pet: TsgcOpenAPI_Pet;
begin
  Client := TsgcOpenAPI_PetStoreClient.Create(nil);
  try
    Client.BaseURL := 'https://petstore.swagger.io/v2';
    Client.ApiKey  := 'your-api-key';

    // Type-safe API call with IntelliSense
    Pet := Client.GetPetById(42);
    try
      Memo1.Lines.Add('Name: '     + Pet.Name);
      Memo1.Lines.Add('Status: '   + Pet.Status);
      Memo1.Lines.Add('Category: ' + Pet.Category.Name);
    finally
      Pet.Free;
    end;
  finally
    Client.Free;
  end;
end;