Common problems

You’re sending major units. "1250" is €12.50, not €1,250. Convert to minor units before sending. See Amounts and currency.

Check the key matches the base URL. neno_api_test_ keys only work against api.neno.build, and neno_api_live_ keys only against api.neno.co.

The public API works out the workspace from the key. Remove the header.

The invoice is still a draft. It gets a number when it’s finalized or sent.

Only accepted quotes can be converted. Record the customer’s decision with POST /quotes/{id}/status first.

Status lists can grow. Add a default case that treats unknown values as in progress, and log them so you can handle them properly later.

You’ve reached the rate limit. Wait for the number of seconds in Retry-After before trying again, and run bulk jobs one request at a time instead of in parallel.