Plus / Minus buttons for editing instead of editing using forms

My app:

I have built a food delivery app. However, as non-cash payments in my target market are not done through credit cards but via mobile money, the Stripe enabled checkout is not useful to me. I have therefore built a different checkout and cart / basket tool, but it is inferior to the Stripe enabled cart / checkout area where users can add / remove items to / from their carts by clicking on a plus or minus button. In the system I’m using, one must edit their cart and delete the item in a series of steps, rather than the fluid plus / minus buttons clearly operable within the system architecture as the stripe enabled credit card checkout supports it. Having the same capabilities as a different button type within the set would be an easy way to achieve this.