Can't create or retrieve payments using the /admin/checkouts/#{token}/payments.json API

Shopify Partner
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I am trying to test out the payments API. I have a valid oauth token and I am able to store credit card data to the shopify session store: 


I am however unable to get any payment information from the payments.json restful api. I keep getting the following response:


{"errors":"Not found"}


Any help is great appreciated!