Need to add JS script in checkout page using app

[ashishgaur]

I've developed an app and now I want to use it to inject a custom JavaScript script into the checkout page.

Please advice, thanks in advance.

[Liam]

Hi Ashishgaur,

It's not possible to inject JS scripts onto checkout pages that are migrated to checkout extensibility. You'll have to create a Checkout UI extension that can be added to a checkout page via the checkout editor. 

[ashishgaur]

Thanks Liam,

I’m a Laravel developer and have built an app using Laravel. Can I use Laravel to create a Checkout UI extension for Shopify?

If that’s not possible, is there a way to programmatically set the "shipping method notice" text field via API or during the app installation process?