StatusInactive indicates this is not an active subscription now.

StatusInit means subscriptions is init.

StatusInitPayFail denotes fail when pay for the first time.

StatusOK means it is a functioning subscription.

StatusRoutinePayFail indicates failure when pays with token.

Subscription is the model for unmarshalling JSON, and serialized to database.

Subscriber provides the interface for different db backendgo:generate mockgen -package=mock -destination=test/mock/mock.go github.com/readr-media/readr-restful/pkg/subscription Subscriber.

InvoiceStore holds the infos for invoice.

PaymentStore wraps the necessary data structure for sqlx gin could bind map[string]interface{} directly, but not sqlx.