Hey fr-tech, filing this request that I've discussed with @AKanji-WMF:
Y'all have done amazing work getting us set up to start including SMS as a feature in our banners. We are going to trial it as an alternative to "Maybe Later" for people who might want to give us a cellphone number instead of email address.
But separate from that, one critical means of building our SMS list would be to see if we can actually integrate a Phone field + permission to SMS directly onto Payments Wiki, as a standard part of the checkout process.
I'm attaching a screenshot of how this might look > you can see the phone field and checkbox in the form.
If there is capacity to work on this, it could be put into immediate use whenever it's ready for the end of year Big English banner campaign.

