Paymentwall Cs Cart

Hi, is there someone succes setting cs cart multivendor with paymentwall, i download this addons from here

and when i try to test pingback it always says order invalid.

what i do until now is, input the key and secret and try to test it

maybe is there someone can help me with this.

platfom user id i set to admin or 1

order_id i set to order_id

still order invalid.