* Refactored GET provider subscription
Refactoring this endpoint and its associated tests in preparation for the addition of more endpoints that share similar patterns
* Replaced StripePaymentService call in AccountsController, OrganizationsController
This was made in error during a previous PR. Since this is not related to Consolidated Billing, we want to try not to include it in these changes.
* Removing GetPaymentInformation call from ProviderBillingService
This method is a good call for the SubscriberService as we'll want to extend the functionality to all subscriber types
* Refactored GetTaxInformation to use Billing owned DTO
* Add UpdateTaxInformation to SubscriberService
* Added GetTaxInformation and UpdateTaxInformation endpoints to ProviderBillingController
* Added controller to manage creation of Stripe SetupIntents
With the deprecation of the Sources API, we need to move the bank account creation process to using SetupIntents. This controller brings both the creation of "card" and "us_bank_account" SetupIntents
under billing management.
* Added UpdatePaymentMethod method to SubscriberService
This method utilizes the SetupIntents created by the StripeController from the previous commit when a customer adds a card or us_bank_account payment method (Stripe). We need to cache the most recent SetupIntent for the subscriber so that we know which PaymentMethod is their most recent even when it hasn't been confirmed yet.
* Refactored GetPaymentMethod to use billing owned DTO and check setup intents
* Added GetPaymentMethod and UpdatePaymentMethod endpoints to ProviderBillingController
* Re-added GetPaymentInformation endpoint to consolidate API calls on the payment method page
* Added VerifyBankAccount endpoint to ProviderBillingController in order to finalize bank account payment methods
* Updated BitPayInvoiceRequestModel to support providers
* run dotnet format
* Conner's feedback
* Run dotnet format'
