Delete database records when Shopify app gets removed from store

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1

I’m building a PHP-based Shopify application and need to clean up database entries when merchants remove my app from their stores. I discovered this webhook configuration code but I’m unsure about the implementation details and how to properly set it up to execute during app removal.

$uninstall_webhook = [
    'webhook' => [
        'topic' => 'app/uninstalled',
        'address' => 'https://mysite.com/app/cleanup_merchant_data.php?store=' . $store_domain,
        'format' => 'json',
    ],
];
$response = $api_client('POST /admin/webhooks.json', $uninstall_webhook);

Can someone explain where this webhook registration should be placed in my app structure and how the cleanup process gets triggered automatically?

2

register that webhook right after the merchant installs ur app, like in the oauth callback or installation flow. when they uninstall, shopify will automatically hit your cleanup_merchant_data.php endpoint and you can delete their records there. dont forget to verify the webhook is legit tho