If you participate in the Amazon Seller Fulfilled Prime scheme, you will want to ensure Prime orders are dealt with quickly and may want to set up Prime-specific shipping rules in Shiptheory.
All Prime orders will be downloaded from Amazon with the word 'Prime' prepended to the Amazon shipping method, e.g. "Prime Std UK Dom_2".
If you wanted to create a shipping rule in Shiptheory specifically for Prime orders, you can create a custom shipping rule using a wildcard character to match anything after the word 'Prime', e.g. "Prime*"
If you wanted to target just UK Prime orders, then add a "where country matches 'GB'" rule on top of the above, and so on.
If you have any questions about this or anything else, just get in contact with the Shiptheory support team!