CREDIT ORDERS IN POS PRESTASHOP: STEP 1.
The first thing we have to do is check that credit payments are allowed in the configuration of our Prestashop POS.
To change the configuration of the module it is necessary to enter the option Configure>Modules> Module Manager> we look for "POS" and select configure. With this the configuration menu will open and we can change the different parameters.
In this case we have to go to the “Statuses and Payment methods” tab.
We make sure that the option "Option to pay invoices on credit" is marked "ON".