Base configuration for payment gateways.
@type t() :: %BasePayment.BaseConfig{ access_token: String.t() | nil, api_key: String.t() | nil, api_secret: String.t() | nil, api_url: String.t() | nil, currency: String.t() | nil, environment: String.t() | nil, locale: String.t() | nil, version: String.t() | nil }