910 Official

Request Parameter Error

A required field is missing or malformed in the request body.

Likely Causes

cmcKey missing from OSCU request body
Invoice number sent as string instead of integer
Date field in wrong format
Tax fields missing — all 15 tax fields (taxblAmtA/B/C/D/E, taxRtA/B/C/D/E, taxAmtA/B/C/D/E) are required even for single-category businesses

Fix

Check all required fields. For OSCU, cmcKey must appear in every transaction request body. Invoice numbers must be sequential integers. Dates must be YYYYMMDD for salesDt/pchsDt and YYYYMMDDHHmmss for cfmDt/stockRlsDt. Set unused tax category fields to zero rather than omitting them.

Gotcha

The official §4.1 Tax Type table states B = 16.00%, but the spec's own JSON samples show the live API returning B-18.00%. Never hardcode tax rates. Always fetch from selectCodes at runtime.

Related Errors