Architect Set Participant Data action ignoring custom variables in IVR flow

Architect & Flows
1

Can’t get this config to load properly…

I am trying to pass a custom variable customer_tier from an upstream REST API call into the IVR flow using the Set Participant Data action. The upstream API returns a 200 OK with the expected JSON payload, and I can see the value in the debug logs immediately after the REST action. However, when the flow reaches the Set Participant Data block, the variable seems to be lost or not applied to the participant object.

Here is the JSON configuration for the Set Participant Data action:

{
 "type": "setparticipantdata",
 "data": {
 "customer_tier": "${rest_api_response.customer_tier}"
 }
}

The expression ${rest_api_response.customer_tier} evaluates correctly in a subsequent Set Variable action, but it appears empty when I try to use it downstream in a routing queue selection or another REST call that requires participant data. Is there a specific scope issue with the Set Participant Data action in IVR flows, or do I need to map this differently? I am using the latest Architect version in eu-west-1.

2

“customer_tier”: “${REST_Response.customer_tier}”

Ensure the expression syntax includes quotes around the variable reference. The Set Participant Data action requires explicit string casting for custom attributes to prevent serialization drops.
3

Have you tried bypassing the expression engine entirely? The Set Participant Data action is notoriously flaky with dynamic inputs. It silently fails if the type doesn’t match exactly.

Just handle the logic in PowerShell. Fetch the tier, update the participant via PATCH /api/v2/conversations/calls/{id}/participants, and let the flow continue. Much more reliable.

Invoke-RestMethod -Uri "https://api.mypurecloud.com/api/v2/conversations/calls/$callId/participants" -Method Patch -Body ($participant | ConvertTo-Json)
4

It depends, but generally… the Set Participant Data action in Architect is designed for static metadata or simple flow variables, not complex object propagation. If your customer_tier is nested deep within the REST response or requires type coercion, the expression engine often silently drops it during serialization.

To maintain traceability and ensure data integrity, inject the value directly via the Genesys Cloud API before the participant object is fully hydrated in the IVR context. Use a REST API block in Architect to PATCH the participant with the specific attribute.

PATCH /api/v2/conversations/calls/{conversationId}/participants/{participantId}
Content-Type: application/json

{
 "customAttributes": {
 "customer_tier": "${REST_Response.customer_tier}"
 }
}

This approach bypasses the internal serialization quirks of the Set Participant Data block. Ensure your OAuth token has the conversation:write scope.

  • Verify REST Response schema matches expected JSON structure
  • Check OAuth scope permissions for participant updates
  • Validate expression syntax in Architect debug logs
5

If I recall correctly, the issue isn’t the Set Participant Data action itself but how Architect handles the scope of REST_Response variables when they cross action boundaries.

  • Use GET('REST_Response.body.customer_tier') explicitly in the expression to force evaluation.
  • Ensure the target field in Set Participant Data is defined as a string type to avoid implicit casting failures.