Enable the Extension

• On Magento admin panel, Navigate to Stores > Settings > Configuration > SunArc > Payment Reminder.
• General Configuration screen opens.
• Enable: Choose Yes to enable the extension
• Payment Method: From the list select the payment method option on which credit purchase option has to be provided to the customers. Enable the selected payment method from the backend in order to make it available for the customer to opt to place on order.

On Magento admin panel, Stores > Configuration > Sales > Payment Methods. Enable the extension which is selected in the payment reminder from here.

• Allowable days for credit: Set the days for which the credit has to be allowed to the customers after which the customer will be in defaulter.
• Reminder Gap: Set the days gap within which the reminder to the customer will be sent informing to make the payment.
• Click Save Config to save the configuration mage to the extension.

You can create two payment methods as per the requirement by filling the details in the block as shown in the image above.