You can configure the payment gateway by navigating to following sections
Dashboard >> WP REM SETTINGS >> PAYMENT SETTING
VAT settings
Add VAT (value added tax) in the following section
PayPal settings
Add custom logo if you want any
Turn off default status if you don’t want to payment with Paypal.
Enter the business email
Enter Ipn Url
Authorize.net Settings
Add custom logo if you want any
Turn off default status if you don’t want to payment with Authorize.net
Turn off Authorize.net sandbox if you don’t want to proceed with sandbox
Add your authorize.net login id
Add Transaction Key
Add Authorize.net Ipn Url
Bank Transfer settings
Add custom logo for payment via bank
Turn off Default status if you don’t want to proceed with bank payment
Add account no.
Add other information which help the user regarding bank payement.
Skrill-MoneyBooker settings
Add custom logo
Turn off the default status if you don’t want to proceed payment with Skrill-MoneyBooker.
Add Skrill-MoneyBooker business email
Add Skrill-MoneyBooker Ipn Url
After adding all the information save the settings.