You can use any merchant service you would like with Bombplates, but PayPal is the only service directly integrated at this time.
To integrate your PayPal account, all you need is your PayPal email address.
1.) Navigate to your Merch settings (Content -> Merch -> Settings)
2.) Enter in you PayPal email address.
3.) Enter in your PayPal handling fee (optional)
4.) Choose Your Currency (Defaults $USD)