# Interfaces

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