#511 Updated Account and Fund services to v6
#516 Added time invariant implementation of validateHMAC
#506 update notification models
#515 add BankTransfer fields to the CheckoutPaymentsAction class
Supported API versions:
- Checkout API version: v67
- Payments API version: v52
- Recurring API version: v49
- Payouts API version: v51
- Account API version: v6
- Fund API version: v6
- Notification Configuration API version: v1
- HOP API version: v6
- BinLookup API version: v50
- Stored Value API version: v46
- POS Terminal Management version: v1
- Data Protection Version: v1