are {account_ID} & {List_ID} static values ?
Also, the service appears to...

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are {account_ID} & {List_ID} static values ?
Also, the service appears to be doing token replacement for you using the DynamicFields.

So, if the two IDs are static & you are willing to do the token replacement on your own (drupal tokens) and send a simple string to the gateway, this would probably work for you.

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