> ## Documentation Index > Fetch the complete documentation index at: https://developer.transactbridge.com/llms.txt > Use this file to discover all available pages before exploring further. # Calculate Product Taxes > Used to preview the pricing, discounts, and taxes for a set of items without saving any data. ## OpenAPI ````yaml /api-reference/Products/product.json post /product/v1.0/calProductSummary openapi: 3.0.3 info: title: Product description: API's to add and get product information. version: 1.0.0 servers: - url: https://sandbox-api.transactbridge.com description: Sandbox Environment - url: https://api.transactbridge.com description: Production Environment security: - ApiKeyAuth: [] SignatureAuth: [] paths: /product/v1.0/calProductSummary: post: tags: - Product summary: Calculate Product Taxes description: >- Used to preview the pricing, discounts, and taxes for a set of items without saving any data. operationId: calculateProductTaxes requestBody: required: true content: application/json: schema: type: object required: - mode - items - quoteCurrCode - billTo properties: mode: type: string enum: - SESSION - SUBSCRIPTION description: >- Required. SESSION or SUBSCRIPTION. Decides which discount object is allowed. quoteCurrCode: type: string description: >- Required*. Currency of the amount values. Filled automatically if the merchant has only one allowed quote currency. billTo: type: object description: >- Required*. Billing address. Decides the tax rules and the legal entity. Filled automatically if the merchant has only one mapped country (other than GLOBAL). required: - country properties: country: type: string description: >- Required. Must be a supported country. Decides whether tax is collected. state: type: string description: Optional. Needed for correct tax in India and the USA. postalCode: type: string description: Optional. Used for pincode-level tax. name: type: string description: Optional. Display only. Not used in the calculation. line1: type: string description: Optional. Display only. Not used in the calculation. line2: type: string description: Optional. Display only. Not used in the calculation. city: type: string description: Optional. Display only. Not used in the calculation. items: type: array description: Required. List of items. At least one item. items: type: object required: - quantity - amount properties: quantity: type: number minimum: 0.000001 description: Required. Must be greater than 0. amount: type: number minimum: 0 description: >- Required. Unit price in quoteCurrCode. Can be 0, but at least one item should be more than 0. name: type: string description: Required if productReferenceId is not sent. Item name. productReferenceId: type: string description: >- Required if mandatoryProductListing is enabled for the merchant. referenceId of a product created with Create Product. hsnCode: type: string minLength: 6 maxLength: 8 description: >- Required if shippable is true. HSN code, 6 to 8 characters. shippable: type: boolean description: Optional. true for goods, false for services. description: type: string description: Optional. Item description. Multiple lines allowed. images: type: array description: Optional. List of image URLs. items: type: string format: uri prorate: type: number description: Optional. Proration factor for a partial period. meta: type: object properties: param1: type: string maxLength: 256 description: >- Optional. Custom fields for your own use. Max 256 characters each. param2: type: string maxLength: 256 description: >- Optional. Custom fields for your own use. Max 256 characters each. param3: type: string maxLength: 256 description: >- Optional. Custom fields for your own use. Max 256 characters each. postalCode: type: string description: Optional. Overrides billTo.postalCode. userTaxId: type: string description: >- Optional. Use a specific tax registration for the calculation. gstInclusive: type: boolean description: >- Optional. true if amount already includes tax. Defaults to the merchant's setting. discount: type: object description: Optional, SESSION only. Discount for a billing session. required: - quoteAmountOff properties: quoteAmountOff: type: number description: >- Required if discount is sent. Fixed amount off, in quoteCurrCode. name: type: string maxLength: 256 description: Optional. Discount label. Max 256 characters. coupon: type: object description: Optional, SUBSCRIPTION only. Coupon for a subscription. required: - code - type properties: code: type: string maxLength: 64 description: >- Required if coupon is sent. Coupon code. Max 64 characters. type: type: string enum: - FIX - PCNT description: >- Required if coupon is sent. FIX (fixed amount) or PCNT (percentage). quoteAmountOff: type: number description: >- Required if type is FIX. Fixed amount off, in quoteCurrCode. pcnt: type: number description: Required if type is PCNT. Percentage off. responses: '200': description: calculated taxes content: application/json: schema: $ref: '#/components/schemas/taxes' components: schemas: taxes: type: object properties: quoteCurrCode: type: string description: Currency you quoted in. quoteAmount: type: number description: Total after discount, in quoteCurrCode. code: type: string description: Merchant settlement currency. amount: type: number description: Total converted to the settlement currency. totalAmount: type: number description: Final amount to pay. quoteAmt: type: number description: Same as quoteAmount. Kept for backward compatibility. tax: type: object description: 'Tax breakdown: rates, amount per tax component, and total tax.' properties: rates: type: array items: type: object amount: type: number totalTax: type: number gstInclusive: type: boolean description: Whether the amounts were calculated as tax-inclusive. discount: type: object description: >- The discount or coupon that was applied, plus amountOff in the settlement currency. properties: amountOff: type: number items: type: array description: Your items, each with inrAmount added (line total × FX rate). items: type: object properties: inrAmount: type: number billDetails: type: object description: The final billTo address and the same items list. properties: billTo: type: object items: type: array items: type: object properties: inrAmount: type: number securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key description: Merchant API Key SignatureAuth: type: apiKey in: header name: x-signature description: Generated request signature ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.