* Initial commit
* Fix the failing text
* Fix the unpaid invoice issue
* fix the unpaid invoice issue
* Changes for the threshold amount
* remove the billing threshold
* Add some comments to the old method
* Fixing issues on secret manager test
* import missing package
* Resolve pr comments
* Refactor PreviewUpcomingInvoiceAndPayAsync method
* Resolve some pr comments
* Resolving the comment around constant
* Resolve pr comment
* Add new class
* Resolve pr comments
* Change the prorateThreshold from 5 to 500 dollars
* Fix the failing test
* Fix the server returns a 500 error with the banner
