We’re running a custom Rust service in Sao Paulo that listens to Genesys Cloud notification events. The goal is to intercept a specific webhook trigger and query the NICE Cognigy API for updated profile tokens. We’re using tokio for the async runtime and serde_json for parsing. The issue is that when the Data Action returns the payload from Cognigy, the JSON structure seems to shift or nest unexpectedly, causing serde to panic on deserialization.
Here’s the relevant snippet from our handler:
#[derive(Debug, Deserialize)]
struct CognigyProfile {
#[serde(rename = "profile")]
profile_data: CognigyProfileData,
}
#[derive(Debug, Deserialize)]
struct CognigyProfileData {
#[serde(rename = "tokens")]
tokens: Vec<TokenEntry>,
}
The webhook payload from Genesys Cloud looks like this when it hits our endpoint:
{
"conversationId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"event": "data_action_completed",
"data": {
"result": {
"status": "success",
"payload": {
"profile": {
"tokens": [
{
"key": "user_segment",
"value": "premium"
}
]
}
}
}
}
}
We’re trying to extract the payload field and deserialize it directly into CognigyProfile. But serde keeps complaining about a missing field or unexpected variant. The error log shows:
Error: Error("missing field `profile_data`", line: 1, column: 128)
The structure seems correct based on the logs. We’ve tried adding #[serde(flatten)] but that just breaks the nesting further. The Data Action in Architect is configured to pass the raw JSON response from the Cognigy REST call. We’re not seeing any truncation in the webhook logs. Is there a known quirk with how Genesys Cloud wraps Data Action responses for webhooks? Or are we missing a layer in the deserialization logic?
We’re using reqwest to make the initial call to Cognigy from the Rust service if needed, but right now we’re just trying to get the parsing right for the incoming webhook. The timezone is America/Sao_Paulo so our logs are UTC-3. The service is deployed on AWS ECS. We’ve checked the network trace and the payload arrives intact. It’s just the parsing that’s failing. We’ve tried using serde_json::from_value with a raw Value first to inspect it, and the structure matches what we expect. But the strict deserialization keeps failing. We’re not sure if it’s a serde issue or if the Data Action output is slightly malformed. We’ve also tried adding #[serde(default)] to the fields but that doesn’t help because the field is definitely there. The error points to line 1 column 128 which is right where the profile object starts. We’re stuck on this one. Any ideas on how to handle this nested structure properly?