Leon,
That is also I am confusing about. If we pass cXMl payload to vendor through HTTP parameter, it will no be cXML format anymore for them. And in HTTP_AAE receiver adapter, it asked "Target Port" and the vendor told me they don't have it. I am able to test the end point of vendor by using Google Chrome Advanced Client if I post empty payload. But I am not able to reach the end point through PI HTTP_AAE adapter.
Hailan