Shopify payment created but order doesn't go through

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I'm using Spreedly and Shopify to process payments in my sales channel. The entire flow is executed correctly, and Shopify returns a success response when I create a payment using its Payment API, but the order is not logged in my development store admin console, nor is my credit card charged. There are no errors anywhere, and I have tried with two credit cards. The order was created a couple times earlier today though, using the same process, so I'm not sure what the problem is. My only suspicions are the following: 1) the `transaction` element in the payments response is `None`, unsure if this indicates a failed transaction and why, and 2) I've been pinging the Payment API all day from the same IP address, so maybe I'm getting blocked?

Any help or advice would be extremely welcomed. Thank you!