Connect the bank app with App that using ionic 5

Hi, my app is work to sell products and make payment transactions online that connect with bank wallet app partners.but I don know how to send the total price to connect with that bank app.
I need your help.

This is a volunteer community support forum. Ordinarily, the most productive conversations go like this:

I’m trying to do X. I have this code, and I was expecting to see Y, but I see Z instead.

So if you could rephrase your question similarly, that would be great. If you’re instead just looking for somebody to work with you to write the app, I would suggest instead posting in the “jobs” subforum.