ACH integration to Stripe gateway and a pop up needed if card is declined due to high risk by gatewa

Hi I have a running store www.remesol.com. I want to integrate ACH by coding in Stripe gateway . I also need a pop up to customer if his/her card is declined by gateway to use ACH as option.

can someone do it ? and what could be cost ?

Here is the solution >>> https://community.shopify.com/c/payments-shipping-and/how-can-i-set-up-ach-payments-and-invoicing-for-my-online-store/m-p/2789246/highlight/true#M92040