What is the best way to send XML from Appian to REST Service

@mohammedz, You have these options:
1. a!httpWrite() function - This can be used from SAIL form. It returns a writer. So, you need to use it in SAIL form.
2. Use the HTTP Query Smart Service from the process model. You can use the POST request and pass the data. You may need to specify the application or content type in the headers of the request to specify that you are passing XML in the body/headers. I would prefer this, as it is easy to setup/configure(compared to the function where you need to use it in SAIL form in combination with bind() ). If possible, you could also create a reusable process model for this, and call it from a SAIL form in a saveInto using the a!startProcess function.

@mohammedz, You have these options:
1. a!httpWrite() function - This can be used from SAIL form. It returns a writer. So, you need to use it in SAIL form.
2. Use the HTTP Query Smart Service from the process model. You can use the POST request and pass the data. You may need to specify the application or content type in the headers of the request to specify that you are passing XML in the body/headers. I would prefer this, as it is easy to setup/configure(compared to the function where you need to use it in SAIL form in combination with bind() ). If possible, you could also create a reusable process model for this, and call it from a SAIL form in a saveInto using the a!startProcess function.