Edit the sample order on the left. The Billit invoice payload on the right is computed live from your changes, using the same mapping engine the automation would run. Change the end customer's name, the invoice customer never moves, only the delivery address does.
This mapping engine is the same file (src/mapper.js) the automated Make.com scenario would call at each step. The sample order above is invented for illustration, it is not connected to your real Mirakl or Billit accounts.