Why isn't my script displaying after successful installation on the store's website?

We have a script that runs when a store installs our application.

def install_script(store): 
    url = 'https://{0}:{1}@{2}.myshopify.com/admin/api/{3}/script_tags.json'.format(
        settings.SHOPIFY_API_KEY, store.api_token, store.store_addr,
        settings.SHOPIFY_API_VERSION
    )
    response = requests.post(
            url, headers=settings.SHOPIFY_HEADERS, data=json.dumps(data)
        )

This runs successfully and we get a 200, but our script is not included in the store’s website.