How to customize checkout page for showing some offer?

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I go through the shopify API but din't find any way to add a script/html code on shopify payment page.

Let's look this, what i'm talking about. Could you please help me out to suggest how to show any offer on payment page before the order place as this shopify app do.

Any suggestion or racecourses that help me to implement such feature on my website will be appreciated.