How to create a fully custom checkout for a Shopify Hydrogen App? Is this possible?

Shopify Discussion
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How to create a fully custom checkout for a Shopify Hydrogen App? Is this possible?

I am working on a Hydrogen project, I need to create an entire custom checkout functionality, Is this possible or not. If possible please provide a clear walkthrough for how to do this.

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Thanks @Parampreet , I will follow the instructions given by you, Will update the result once it finished.