API Express - Name or service not known.

I'm trying to get the demo app from this (https://docs.appery.io/docs/samples-p...) tutorial working. All authorization is working properly, the problem comes when the payment_create service is invoked. The service will generate a response no problem when using the "Generate" button on the REST block, but testing the entire service, as well as running the app and clicking the "Make Payment" button, results in the following error when in debug mode:

It doesn't seem like an especially whacky error, but surprisingly I've found absolutely no documentation on that particular message.

Of course I'm prepared to share the app with support and/or provide whatever additional information would be helpful - all the app/db/server code/api express settings are in accordance with the tutorial.

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