Unable to process Payment through WooCommerce Payment methods

I am testing this at the suggestion of a credit card processor. The workflow I am working on is simple to vcreate my own payment pages

enter new order
mark as “invoice”
let customer PAY invoice using the already established WooCommerce Payment methods

I can’t seem to figure out how to allow the invoice to be paid by the already existing WooCommerce Payment methods like CardConnect, Stripe etc? Is this not in fact possible to do? being that it’s part of a WC site one would think it could use those payment methods NOT just the ones directly integrated into the core Sliced Invoices platform.