# Marketplace Add-on Listing Tutorial

This tutorial provides instructions for installing and using the Marketplace Add-on, Prove TCPA Compliance in the Twilio Lookup API. After reading this tutorial, you will be able to install and use this Add-on. For more detailed instructions on how to install and configure an Add-on listing, visit our [usage guide](/docs/marketplace/listings/usage#installation-1).

## Install an add-on listing

Add-on listings can be installed and enabled through the Twilio Console. Once installed, they enhance specific Twilio APIs, such as [Twilio Voice](/docs/voice) and [Programmable Messaging](/docs/messaging). One popular feature from Marketplace Add-ons is ensuring a number is compliant with Telephone Consumer Protection Act (TCPA) regulations.

To install the Prove TCPA Compliance, follow these steps:

1. Select **Prove TCPA Compliance** from the catalog.
2. Click **Install**.
3. Under the **Configure** tab, check the **Lookups** box.
4. View all installed Marketplace Add-ons by clicking on **Marketplace > Installed**.

## Use the Prove TCPA Compliance Add-on listing

Prove TCPA Compliance is an Add-on that allows you to verify if a phone number is active and still owned by the customer before sending an SMS message. This helps ensure compliance with Telephone Consumer Protection Act (TCPA) regulations.

To use this Add-on, install it just like Trestle Reverse Phone. Go to the [Add-on catalog](https://www.twilio.com/console/add-ons), locate and click on Prove TCPA Compliance, and click **Install**.

![Add-ons Prove TCPA Compliance.](https://docs-resources.prod.twilio.com/a23853da53ba0d2710b470125e4cfaae3c1722e3dbae6d95a921983860548608.png)

Since the goal is to leverage the [Twilio Lookup API](/docs/lookup/v2-api) to find TCPA compliance information for a phone number, check the **Lookups** box under the **Configure** tab of the Prove TCPA Compliance Add-on. Afterwards, query for the TCPA compliance information on the target phone number using the following code:

```bash
curl --location --request GET 'https://lookups.twilio.com/v1/PhoneNumbers/+16505399600/?AddOns=prove_tcpa_compliance&AddOns.prove_tcpa_compliance.RightPartyContactedDate=20160101' -u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN
```

Example response:

```json
{
    "Status": 0,
    "Description": "Success",
    "RequestId": "7f83-b0c4-90e0-90b3-11e10800200c9a66",
    "Response": {
        "VerifyNumberTransactionId": "144356671",
        "PayfoneAlias": "C24C4C54DR10481C4E0U44ERMVUP9S1TUNXPLA2T753ETMCFOA086TYMCAQL00B4E0CLC4C24BHZPO4QWPN68EAV14ERTVPMMEP7OCXTRBQR17YERTMK749",
        "MSISDNType": "Mobile",
        "NumberMatch": "Y"
    }
}
```

The results from the TCPA Compliance Lookup are organized into a structured format. The key `NumberMatch` indicates `Y` for a compliant number, `N` for a non-compliant number, and `I` for an indeterminate number. The response also includes keys related to the identification of the device claiming ownership of the number. For demographic and carrier information, use the Trestle Reverse Phone Add-on.

For more information on using Marketplace Add-ons, refer to the [How to use Add-on Listings Guide](/docs/marketplace/listings/usage#add-on-listings).