enums library Null safety

Enums

CurrencyType
The fiat currency type for which transactions are made. defaults to the US dollar.
PricingType
Available Pricing Types PricingType.fixedPrice allows the payee to parse in a specified price for payment PricingType.fixedPrice ensures the payer can input any amount for payment
TransactionStatus
Enumerates all the possible status responses of a coinbase charge
Verbose
The logging level while in debug mode