Can I receive Data Push transaction keys in a certain order each time?

When you visit a Data Push integration's Mappings tab, you may notice that the order of the mappings is arranged in alphabetical order. That's how it's organized in the ItemPath user interface, but it doesn't represent the way the object keys will be ordered in the transaction body.

There's actually no way to order object keys—JSON standard doesn't support it. If you need to receive your object keys a certain way, consider how you name your mappings for your integration logic (e.g. prepending the mapped names with letters or numbers).