Is it possible to redirect the payers to a particular payment method bypassing the full checkout page?

Sure, if you want to show only one payment method on your checkout page, you need to specify the payment method ID when creating an invoice using the “Create invoice” request for the “Payment method” parameter. 

To redirect the payer to the payment method page, bypassing the Payop checkout page, you must provide us via API with the payer information fields required for the “payment method” you specified in the request.

Required fields can be found in the “config” of the response for the following API request.

Example of the request: https://github.com/Payop/payop-api doc/blob/master/Invoice/createInvoice.md#request-example.