Trying to understand how to properly inject custom guest attributes into the Genesys Cloud Web Messaging widget for already authenticated portal users before the conversation payload hits our S3 staging buckets.
Problem
We deploy the standard web messaging script, but the default guest object lacks our internal customerId and tier fields. I need to push these via the Guest API before the widget initializes so the analytics export captures them correctly.
Implementation Attempt
I am calling the platform endpoint directly from a frontend module:
const payload = {
externalContactId: "ext_usr_9942",
customAttributes: {
"customerId": "C-8821",
"tier": "enterprise"
}
};
fetch("https://api.mypurecloud.com/api/v2/conversations/webmessaging/guests", {
method: "POST",
headers: {
"Authorization": "Bearer " + token,
"Content-Type": "application/json"
},
body: JSON.stringify(payload)
});
Error Response
The request consistently returns a 400 Bad Request with the following body:
{
"code": "bad.request",
"message": "customAttributes is not allowed in this context",
"status": 400
}
Question
The documentation states that custom attributes must be passed during the initial session creation, yet the schema validation rejects the nested object. Should I be using the applicationData field instead, or is there a specific SDK method like genesyscloud.messenger.setGuestAttributes() that bypasses this validation? I need a reliable pattern to ensure these fields populate correctly before our PySpark jobs process the exported conversation records.
Custom guest attributes can be attached to the web messaging session payload by extending the initial guest creation request. Ensure all keys match the expected string format.
Any precise examples of the exact JSON structure accepted by the v2 endpoint would be appreciated.