> 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

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