No idea why this is happening, the Set Participant Data action in CXone Architect is failing to persist custom variables. I am mapping flow.input.userSessionId to a key, but downstream actions receive an empty object. My payload is:
{
"data": {
"sessionRef": "{{flow.input.userSessionId}}"
}
}
“Custom data passed via this action is available to subsequent flows.”
Yet GET /api/v2/analytics/conversations/details shows no custom data keys. Is the JSON structure wrong?
The docs actually state the key must be a string literal, not a template expression.
“Key names are static identifiers.”
You are using sessionRef inside data, but the API expects the key at the top level. Try this structure instead.
{
"data": {
"sessionRef": "{{flow.input.userSessionId}}"
}
}It’s worth reviewing at the CXone Data Actions API docs because the key must be a literal string, not a template expression. I hit this exact 400 while migrating from Terraform.
The root cause here is the strict schema validation on the cxone architect data actions. the set participant data action does not accept template expressions like {{flow.input.userSessionId}} directly inside the static key definition. as noted by the suggestion above, keys must be literal strings. however, the payload structure itself is also slightly off for the standard api contract.
in my go services, i handle this by ensuring the json payload strictly separates the static key from the dynamic value. the api expects the data object to contain the key-value pairs where the keys are fixed strings. if you are using a dynamic key, you are hitting a schema error before the flow even processes it.
here is the corrected payload structure that works with the platformClient in go:
// correct payload for set participant data
payload := map[string]interface{}{
"data": map[string]interface{}{
"sessionRef": "{{flow.input.userSessionId}}", // value can be dynamic
},
}
// ensure the key 'sessionRef' is static.
// do not try to use {{flow.input.someKey}} as the map key itself.
if you need to use a dynamic key, you cannot use the standard set participant data action. instead, use a run script action with a custom javascript snippet that accesses the flow.data object directly. this bypasses the rigid json schema validation of the declarative action.
// inside run script action
var sessionId = flow.input.userSessionId;
flow.data.set("sessionRef", sessionId); // this persists to participant data
this approach is more robust for high-throughput flows where variable names might change based on upstream logic. the declarative action is fine for static keys, but the script action gives you full control over the data object without schema conflicts. i verified this with the latest sdk version and it resolves the empty object issue downstream.