[Feature] Improve discount functionality

[mariusmorabosch]

Is your feature request related to a problem? Please describe.

The current discount functionality is extremely bare-bones for the main native SDK.
We want to reduce friction on purchases by reducing the steps to purchase when launching through deeplinks or ads within the app. The current user-facing information regarding discounts is non-existent which makes just presenting the payment sheet confusing as it's not clear if a discount is applied or not.
Not being able to manually input coupons also reduces the flexibility on running promotions through stripe.

Describe the solution you'd like

I want to:

• Be able to input promo codes directly on the payment sheet
• Be able to visualize what discounts have been applied to a purchase on the payment sheet

Describe alternatives you've considered

Building our own UI on top of it, but it increases steps to complete until purchase - also it defeats the purpose of taking advantage of the pre-built stripe UI sheet.

Additional context

This is not an e-commerce style application so you don't have a traditional cart-style UI that satisfies these requirements.

[porter-stripe]

Hi @mariusmorabosch thanks for the suggestion, we have this on our radar but no timeline available to share on when/if we will build this. I'll share this feedback with the team.