GoProposal doesn't take payments because we believe the payment mechanism should be connected to your accountancy software.
Instead we integrate with both Xero and Quickbooks to allow you to take payments through the standard invoicing. This also means you aren't giving us a percentage of the payments taken.
You need to connect GoProposal up with Xero or QuickBooks and from there you’d hook your accountancy software up to GoCardless. In GoProposal you can trigger the correct branding theme to make this work seamlessly.