# Billing

- [Bill](/docs/navixy-api/user-api/backend-api/resources/billing/bill.md): Bill object description and API calls for work with user's bills.
- [Payment system](/docs/navixy-api/user-api/backend-api/resources/billing/payment_system.md): Payment system settings object and API calls for working with payment systems and make payments.
- [Subscription](/docs/navixy-api/user-api/backend-api/resources/billing/subscription.md): API calls to interact with payment subscriptions
- [Transaction](/docs/navixy-api/user-api/backend-api/resources/billing/transaction.md): Transaction object description and API call to get list of user's billing transactions for the specified period.
- [Tariff](/docs/navixy-api/user-api/backend-api/resources/billing/tariff.md)
- [Plan](/docs/navixy-api/user-api/backend-api/resources/billing/tariff/index.md): Tariff object description and API call to get the list of device's tariffs available to user.
- [Tracker plans](/docs/navixy-api/user-api/backend-api/resources/billing/tariff/tariff_tracker.md): API calls on user's actions with tracker tariffs