Is there a way to choose a payment system that will be defaulted to in the Add Invoice page? I'd like the field to be defaulted to PayPal if possible.
It is not possible to do from admin interface. You need to customize one core file to achieve your needs. It is amember/application/default/controllers/AdminUserPaymentsController.php. Please find addInvoiceAction method and replace PHP: ->loadOptions(array(''=>'') + $this->getDi()->paysystemList->getOptions()); with PHP: ->loadOptions(array(''=>'') + $this->getDi()->paysystemList->getOptions()) ->setValue('paypal'); Please note these changes can be overwritten with upgrade.
This is working great thank you Caesar. I will make a note that I'll need to change this after upgrade.