Include Link in Polling Budget

[jkelle-stripe]

Summary

Adds Link in Payment Method Mode to the Polling Budget of 5 seconds.

Motivation

When Link is in Payment Method Mode and using a payment method that supports next_action_type: redirect_to_url (eg. Pix in this example), the backend currently does call the return_url strictly after the the payment intent succeeds. This results in the web view closing and the payment intent state remaining at confirm without an opportunity to refetch status.

This is a bug in the backend implementation for Pix, but won't be addressed prior to our intended release of Link LPMs on mobile. By adding Payment Method Mode polling for link types, we work around this bug and will readdress once this bug is resolved.

Demos

Before	After
Simulator.Screen.Recording.-.iPhone.17.Pro.Max.-.2026-04-16.at.10.50.03.mov	Simulator.Screen.Recording.-.iPhone.17.Pro.Max.-.2026-04-16.at.10.51.16.mov

[mats-stripe]

@jkelle-stripe does this change have any impact on Link payments that don't require "next actions"?

[jkelle-stripe]

does this change have any impact on Link payments that don't require "next actions"?

@mats-stripe Good question. This polling budget is only used here which isn't reached for Card, Card w/ 3DS, or Bank txns. Let me know if I'm missing other payment method scenarios though (besides the LPMs of course).