How can I fix my custom Shopify app using Branding Api?

Shopify Partner
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Hi Everyone,

I'm Ahsan Ahmed, and I Created a Shopify custom app for checkout customization using Branding Api, firstly I tried to use query and mutation in graphql app in our development store, I'm trying to reach custom app but showing error in console, I'm following multiple steps but did not achieve my goal, can any one help me:
Error attached in below:



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