[WIP] Venmo Universal Links v5

[sarahkoop]

Thank you for your contribution to Braintree.

Before submitting this PR, note that we cannot accept language translation PRs. We support the same languages that are supported by PayPal, and have a dedicated localization team to provide the translations. If there is an error in a specific translation, you may open an issue and we will escalate it to the localization team.

Summary of changes

Checklist

• [ ] Added a changelog entry
• [ ] Relevant test coverage

Authors

List GitHub usernames for everyone who contributed to this pull request.

PayPal and Braintree engineering requirements

If you're an engineer for PayPal or Braintree, complete this section. For PRs from the community, please ignore!

When do these changes need to be released? [ ] ASAP (let's discuss outside this PR) [ ] Soon, here's our target release date: <DD/MM/YYYY> [ ] Whenever, no rush