Plugin is not saving data changes nor following form requests

Hi, I recently started playing with the WHMCS WP Integration Plugin and little by little I'm getting it to work yet I have come to a problem I can't seem to get around of.

The plugin is displaying the information correctly wherever I need it but when I try to make a change on costumer details or even process an order the plugin does not either save the information nor follows to the next step in the form.