In order to setup your hosting package types from your Eco Web Hosting account go to
Reseller Services: Your Greenhost Shop > Payment Methods
From the subsequent page you have default options to setup Paypal, card payment (through Paypal Pro) and Custom Gateway Integration.
To setup Paypal you will need your Paypal email address, you are also able to set this payment gateway up using your sandbox details for testing:
To setup card payments, again you will need your Paypal Pro details and you test this in sandbox mode:
You will also have the option to add a custom gateway if you have a preferred provider.
** Please note - this requires knowledge of PHP, IPNs and online financial transactions and is not something support can help directly with the customisation of. **