> ## Documentation Index
> Fetch the complete documentation index at: https://developer.zamp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Certifying Your Integration

> Learn how to certify your integration to Zamp.

# Overview

Zamp is a customer-obsessed company. Our integrations are expected to support every customer’s biggest Sales Tax needs. To ensure your integration meets that standard, follow the certification guidelines.

## Case Categories

Certification cases are broken up into categories with a variety of cases for each category. Each category will robustly test all potential functionality for that respective workflow or API endpoint.

<AccordionGroup>
  <Accordion title="General and Configuration">
    * Do you have the necessary documentation for customers to install and use?
    * Can users assign Product Tax Codes and Exemptions?
    * Do customers have all of the testing materials necessary?
  </Accordion>

  <Accordion title="Authentication">
    * Is the integration able to connect to Zamp?
    * Can you customers access Zamp endpoints?
    * Are keys and credentials securely stored?
    * Can a key be rotated as necessary?
  </Accordion>

  <Accordion title="Calculations">
    * Can your integration calculate taxes accurately based on the information within a customer’s transaction?
    * Can customers see estimated taxes when building an order if they have a storefront?
  </Accordion>

  <Accordion title="Transactions">
    * Will all transactions be posted to Zamp?
    * Do you use Zamp’s calculations to push accurate taxes for filing?
  </Accordion>

  <Accordion title="Refunds">
    * Can customers initiate refunds and have them reflect accurately in Zamp?
    * Are you linking transactions accurately? 
  </Accordion>

  <Accordion title="Address Validation">
    * Does your integration support address validation?
    * Can you normalize corrected addresses sent back from Zamp?
  </Accordion>
</AccordionGroup>

## Required Functionality

Certain workflows are optional when building an integration to Zamp depending on the type of platform, but there are non-negotiable requirements which are to the benefit of our customers.

**Required Workflows**

Bearer Token Authentication to Zamp’s APIs Within Your Platform

<u>All</u> Transactions Are Posted to Zamp Regardless of Nexus Status if Filing with Zamp

Historical Sync or Transaction Backfill Functionality

Functionality to Map Zamp Product Tax Codes to Products

Functionality to Map Exempt Customers AND Products

Decoupled Calculation and Transaction Posting Process

Either Cash-based or Accrual-based Account Transaction Posting

Passing of the Destination Address on All Transactions for BOTH Calculations and Transactions

## Certification Guide

Review the Certification Spreadsheet attached here for the required integration cases, and to establish a framework for your development plan. Depending on the level of service you are leveraging, certain cases can be removed or altered.

[Certification Cases](https://docs.google.com/spreadsheets/d/1JvkUwXPADRN1dxywssfzDjAlDzM86W43NN5l8ZCzuEI/edit?usp=sharing)