Fix order intent use-case

[saperi22]

Summary of changes

• Update helper function to ignore case when checking for string equality.
• Our demo app isn't setup for creating a customer when doing a checkout -- so the transaction itself fails, but this indicates that we're sending the intent=order as expected.

Checklist

• Added a changelog entry
• Relevant test coverage
• Tested and confirmed payment flows affected by this change are functioning as expected

Authors

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