I just had a hard time to set up the paid Drupal module File Download Suite with PayPal as a the payment method. Payments got stuck, emails haven't been sent and user accounts weren't created when they should have been.
Here's what I did to solve the issues and finally making successful purchases:
- remove any .htaccess password protection on the dev site
- set up my PayPal (sandbox) account to auto-accept payments in any currency (accept and convert them automatically), you find this option somewhere hidden in your merchant accounts selling preferences
- don't use the module Automatic User Names as it will throw PDO exceptions when moneyscripts tries to create a new user account for your order
Now there are only some translation issues left to be resolved and everything will hopefully work as planned.