> For the complete documentation index, see [llms.txt](https://developer.firmhouse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces.md).

# Interfaces

- [FirmhouseAppliedOrderDiscountPromotion](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-applied-order-discount-promotion.md)
- [FirmhouseAppliedPromotion](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-applied-promotion.md)
- [FirmhouseBillingCyclePromotion](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-billing-cycle-promotion.md)
- [FirmhouseCart](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-cart.md)
- [FirmhouseCollectionCase](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-collection-case.md)
- [FirmhouseConfig](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-config.md)
- [FirmhouseDiscountCode](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-discount-code.md)
- [FirmhouseExtraField](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-extra-field.md)
- [FirmhouseExtraFieldAnswer](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-extra-field-answer.md)
- [FirmhouseInvoice](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-invoice.md)
- [FirmhouseInvoiceLineItem](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-invoice-line-item.md)
- [FirmhouseInvoiceReminder](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-invoice-reminder.md)
- [FirmhouseOrder](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-order.md)
- [FirmhouseOrderLine](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-order-line.md)
- [FirmhouseOrderedProduct](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-ordered-product.md)
- [FirmhouseOrderedProductUtils](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-ordered-product-utils.md)
- [FirmhouseOrderedProductWithUtils](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-ordered-product-with-utils.md)
- [FirmhouseOriginalInvoice](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-original-invoice.md)
- [FirmhousePayment](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-payment.md)
- [FirmhousePlan](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-plan.md)
- [FirmhouseProduct](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-product.md)
- [FirmhouseProject](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-project.md)
- [FirmhousePromotion](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-promotion.md)
- [FirmhouseRefund](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-refund.md)
- [FirmhouseSubscribedPlan](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-subscribed-plan.md)
- [FirmhouseSubscription](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-subscription.md)
- [FirmhouseSubscriptionUtils](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-subscription-utils.md)
- [FirmhouseSubscriptionWithUtils](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-subscription-with-utils.md)
- [FirmhouseTaxRate](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-tax-rate.md)
- [FirmhouseVerifiedIdentity](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmhouse-verified-identity.md)
- [FirmouseCollectionCase](https://developer.firmhouse.com/sdks/firmhouse-sdk/reference/interfaces/firmouse-collection-case.md)