Setting response URLs

[reeze]

I am installing a credit card payment module for a client in south africa called vcs  (www.vcs.co.a)

The module integrates fine except

the invoices generated by the payment method showed price taxes and shipping but not what products were bought.

that section is just empty.

 

VCS want me to specify response url's- 

Can anyone one help - where should I be specifying the url's and what those urls' should be?

Edited November 7, 2014 by reeze (see edit history)

[reeze]

Very frustrating.

It would appear the problem was not this complicated at all. 

the solution was in replacing the invoice logo with a jpg - it was initially a png 

that solved everything.

Edited November 7, 2014 by reeze (see edit history)