To use a web service, you need to make an HTTP request using an XPRIM_HttpRequest object.
Below is an example of how to do a simple GET request, and get the response as a string:
Define_Com Class(#XPRIM_HttpRequest) Name(#Request)
Define_Com Class(#PRIM_DC.UnicodeString) Name(#ResponseText)

• Do the get request
  #Request.DoGet Url('http://mytestserver/api/echoservice')
• Get the result as string
  #ResponseText := #Request.Response.AsString
  The XPRIM_HttpRequest has the following methods (each corresponds to an HTTP verb):
• DoGet
• DoPost
• DoPut
• DoDelete
• DoPatch
• DoTrace
• DoHead
• DoOptions

Next: Setting Up Your HTTP Request