How to Customer session Token in theme app extensions

Extensions
1

How to find Customer Session Token when we are using Theme app Extensions.

If we want to check whether the customer is logged in or not how?

2

Hey @Soumya_pittala, since theme app extensions use liquid, you can check this using the customer object

3

If our backend wants to validate the customer session on storefront how?

4

Hey @Soumya_pittala,

For backend validation from a Theme App Extension, the approach is to use an App Proxy. When you route requests through an App Proxy, Shopify automatically appends a logged_in_customer_id parameter to the forwarded request (populated if a customer is logged in, empty if not), along with a signature parameter that lets your backend verify the request genuinely came from Shopify.

The App Proxy authentication docs walk through the signature calculation with code examples.