# Address validation service

Source: https://developer.avalara.com/avatax-for-ap/zpi9103967107108/

# Address validation service

Learn about Avalara's address validation service, its requirements, and how to use it effectively.

**Element type:** Required

**Endpoints/models used:** [ResolveAddressPost](https://developer.avalara.com/api-reference/avatax/rest/v2/methods/Addresses/ResolveAddressPost/) or some other third-party validator

Your integration must include a method to validate an address in the UI wherever addresses are entered. You can use the Avalara address validation service or some other third-party validator. If you plan to use the Avalara address validation service, then use the [ResolveAddressPost](https://developer.avalara.com/api-reference/avatax/rest/v2/methods/Addresses/ResolveAddressPost/) API.

Address validation certification requirements are called out in the [badge requirements](https://developer.avalara.com/certification/avatax/address-validation-badge/) page.

Note

-   Avalara's address validation service doesn't currently provide autocomplete or suggestions when users input an address.

-   Avalara's address validation service supports only U.S. and Canadian addresses. If you use the Avalara's address validation service, we disable address validation in your UI if a user inputs an address outside of the U.S. or Canada.

Tip

A validated address provides you with the best tax result; an unvalidated valid address will still likely get you a tax result, but it may not be as accurate as the validated result.

The following example shows how to call the [ResolveAddressPost API](https://developer.avalara.com/api-reference/avatax/rest/v2/methods/Addresses/ResolveAddressPost/).

**View example**:

```
curl
  -X POST
  -H 'Accept: application/json'
  -H 'Authorization: Basic ${btoa(`:`)}'
  -H 'Content-Type: application/json'
  --data '{
    "line1": "2000 Main Street",
    "textCase": "Upper",
    "city": "Irvine",
    "region": "CA",
    "country": "US",
    "postalCode": "92614"
  }'
  'https://sandbox-rest.avatax.com/api/v2/addresses/resolve'
```