3692642 - Error During JSON Serialization or Deserialization When Calling SAP CPQ Custom API with Request Payload Larger Than 2 MB

The following error is returned when calling the SAP CPQ Custom API endpoint:

POST https://<CPQ URL>/customapi/executescript?scriptName=<scriptname>

{
  "Status": "Error",
  "ErrorMessage": "Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.\r\nParameter name: input"
}

SAP CPQ

SAP CPQ API, serialization error, deserialization error, maxJsonLength property, payload size limit, 2MB restriction, request payload error, HTTP adapter issue, Content Modifier step, SAP CPI integration, JSON error , KBA , CEC-SAL-CPQ , Sales Cloud CPQ , Problem