HOOK_URL SAP send SAPEVENT:POST

Hi all experts!

SAP send always SAPEVENT:POST as Return_url (HOOK_URL) to the catalog.

The Parameters are

URL               testurl of the catalog Type2

USERAME     testuser                     Type2

PASSWORD  ********                       Type2

HOOK_URL                                     Type4

When the catalog is called, it shows the parameters sendet from SAP as follow:

USERNAME =  testuser

PASWORD  =   *********

HOOK_URL =  SAPEVENT:POST

METHOD = GET

What's wrong?

Thanks in advance

hirzi