Checkout API scope on a private app?

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Hello, I discovered the checkout API while looking for a way to process payments and create an order programmatically from another checkout/landing page as the Shopify checkout is limited for my use.

However, I need a client ID and client secret to authenticate. I started to create a private app which should give me what I need but it does not have the checkout API as an option in the scope of permissions.

How do I authenticate myself to use the checkout API without a private app or how do I get the checkout permission?