Calculate Customs Duty

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Sales Tax API Reference

Customs Duty API Reference

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Welcome to Commenda's API Documentation! Learn how to use our API to manage your global tax workflows.

Introduction

Product tax codes determine taxability for each line item in an invoice.

Commenda Tax Codes

Learn how to use the Commenda API to manage your taxes.

Sales Tax Transactions

Nexus

Exemptions

Understand how Commenda's Sales Tax API manages corporations for both single and multi-entity implementations.

Corporations

Get all corporations associated with a sales tax partner.

List corporations

Get corporation

Create a new corporation for a sales tax partner.

Create corporation

Update corporation

Delete corporation

Calculates the tax amount for a given transaction.

Tax Calculations

Calculate tax

Record transactions after they occur to remit and file the correct amount.

Tax Transactions

Submit a completed transaction for processing and filing

Create a transaction

Retrieve one transaction by its identifier

Get transaction

List all transactions that match this query

List transactions

Delete transaction

Mark a transaction as returned to receive credit against a future tax liability.

Return Transactions

Create a RETURN transaction linked to an existing invoice to receive credit against a future tax liability.
The resulting RETURN transaction will have negative line amounts and will be properly linked to the original sale.

Create a return

Utility for sellers to bulk upload transactions.

Bulk Transactions

Submit a file of completed transactions for processing.
The CSV file must include required fields for both SALE and RETURN transactions.
For RETURN transactions, all line items must have negative total amounts and should include parent_invoice_id when available.

Upload bulk transactions

Get nexus status for one seller for all US states

Get nexus

A system for sellers to manage their tax registrations, enabling accurate calculations and automated filing.

Tax Registrations

Allows customers to inform the system about states where they are already registered for sales tax.

Create registration

Fetches all sales tax registrations associated with a specific corporation.

List registrations

Get registration

Allows customers to provide additional information about states where they are already registered for sales tax.

Update registration

Allows customers to remove a sales tax registration with `validation_status` in `PENDING`, `INVALID`, or `VALIDATION_IN_PROGRESS` states. Customers should reach out directly to Commenda for registrations in `VALID` state.

Delete registration

When all necessary details are provided and a seller is ready to start filing in a state, call this endpoint to request that the Commenda team onboard your sales tax registration for filing.

Request validation

Request new sales & use tax registrations for a seller in a particular state.

New Registrations

Get required information for new registrations

Submit required information for new registrations

List state and local sales tax filings for a corporation, filtered by query.

List filings

Get one filing

Manage products and their tax codes for a corporation.

Products

Create product

List products

Get product

Update product

Delete product

Bulk Products

Submit a CSV file of products for processing

Upload bulk products

Manage customers and their exemption certificates.

Customers

Create a customer to track their exemption certificates and default values for their addresses.

Create customer

List customers associated with a corporation.

List customers

Get detailed information about a specific customer, including exemption certificates.

Get customer

Update a customer, including their addresses and exemption certificates.

Update customer

Delete customer

Manage exemption certificates for a customer.

Exemption Certificates

Create an exemption certificate for a customer

Create exemption certificate

Get a specific exemption certificate by id.

Get exemption certificate

Get a list of all exemption certificates.

List exemption certificates

Delete an exemption certificate. This does not delete the associated file.

Delete exemption certificate

Files

Create files

List files

Retrieve one file by its id, along with a signed URL to download it

Get file

Delete file

Receive real-time notifications about system events.

Webhooks

Topics and Events

Create webhook

Get webhook

Get a list of all webhooks registered with Commenda.

List webhook

Update webhook

Delete webhook

Test webhook

Calculates the customs duty rate for a given shipment.

Customs Duty API

Calculate customs duty