Develop Integrations with Web Services | APIs

We Add Customer Payments through Acumatica’s Screen Based API (We use Authorize.NET’s Customer Information Manager for processing).  It works fine for a customer’s first payment method.  When we attempt to add a new Payment Method (Same CustomerProfileId but different PaymentProfileId), it doesn’t throw an exception but it does not add.  It returns the existing Payment Method Token. Here is my current code:                AR303010Content AR301000 = context.AR303010GetSchema();                context.AR303010Clear();                AR303010Content[] AR303010content = context.AR303010Submit(                    new Command[]                {                    new Value { Value = customerId, LinkedCommand = AR301000.PaymentMethodSelection.Customer },                    new Value { Value = ccType, LinkedCommand = AR301000.PaymentMethodSelection.PaymentMethod },                    new Value { Value = "AUTHNETAPI", LinkedComma

Creating a Bill document with all fields populated using SOAP results in error “System.InvalidOperationException: Cant find method for action \"http://www.acumatica.com/entity/3/DefaultRLSFT/17.200.001/Put\"\n   at System.Monads.ArgumentCheck.CheckNull[TSource](TSource source, Func`1 exceptionSource)\n   at PX.Api.ContractBased.Soap.WebApiSoapController.<Login>d__6.MoveNext()\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at System.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__1`1.MoveNext()\n--- End of stack trace from previous location where exception was thrown ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at System.Web.Http

Has anyone figured out silent login of Acumatica user? We should be able to pass the user id and pwd to specific URL and auto-login or silent login so it bypasses the login and takes you to specific page to perform certain action and then when we close it logs off, this shld be possible assuming help.acumatica.com works that way.  This feature allows to do lot of things within the framework and allows to scale for online approvals or proofing etc. Any hacks or thoughts, pls share.