we have a Prestashop plugin module (a paymeny gateway to our website). It works on Prestashop 1.5/1.6 but not on the 1.7 version.
Our current module can be installed correctly on the 1.7 version. The menu on the backoffice is working fine. But the module payment does not seem to be enabled.
I will send you the source code of the module (compatible with version 1.5 and 1.6 of prestashop).
It should be only an upgrade not a full module development.