During the private alpha testing, all Pro features are open to everyone for free. No billing needed.
For safety consideration, we will still limit the volume by promoting all users to the Tester plan (not exactly Pro plan in the future) during our private alpha testing.
If you are interested in using our Pro volumes or simply want to support us for making great products, feel free to upgrade to the Pro plan.
Please note that: Tester plan is now planned to be ended on Oct 1, 2022. All existing Tester plan users will be downgraded into Essential plan, which only has non-Pro features.