Unable to retrieve data from server! Check used credentials.

Estou tentando executar os testes do payment provider, mas recebo esse erro constantemente, minhas configurações de CORS estão de acordo com o necessário, observando a solicitação via ferramenta do desenvolvedor o que retorna é esse erro na parte de vocês, e não chega nem a executar quaisquer chamada para minha URL. Já tentei https e http e em nenhum caso obtive sucesso.

{"error":{"code":"1","message":"Acesso negado","exception":{"ClassName":"Vtex.Practices.ServiceModel.Client.Exceptions.ForbiddenException","Message":"Acesso negado","Data":null,"InnerException":null,"HelpURL":null,"StackTraceString":" at Vtex.Practices.ServiceModel.ServiceAuthorizationFilterAttribute.OnAuthorization(HttpActionContext actionContext)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.OnAuthorizationAsync(HttpActionContext actionContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Tracing.Tracers.AuthorizationFilterAttributeTracer.<>c__DisplayClass4.<<OnAuthorizationSyncCore>b__1>d__6.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Tracing.ITraceWriterExtensions.<TraceBeginEndAsyncCore>d__24.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__0.MoveNext()","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8\nOnAuthorization\nVtex.Practices.ServiceModel, Version=6.0.1.0, Culture=neutral, PublicKeyToken=null\nVtex.Practices.ServiceModel.ServiceAuthorizationFilterAttribute\nVoid OnAuthorization(System.Web.Http.Controllers.HttpActionContext)","HResult":-2146233088,"Source":"Vtex.Practices.ServiceModel","WatsonBuckets":null}}}

Ola, para usar essa API deve usar as credenciais da loja disponiveis no License Manager