Outbound Campaign Predictive Dialing PATCH returning 409 on contract verification

{
“dialingType”: “predictive”,
“progressive”: false,
“ratio”: 1.5,
“timezoneId”: “America/Los_Angeles”
}

Pact provider verification won’t pass at PATCH /api/v2/outbound/campaigns/{id}. Genesys Cloud 2024-09-12 returns 409 Conflict when the contract expects a 200. Pipeline runs on US/Pacific midnight. Provider state campaign_active doesn’t match the actual edge response. Ratio validation throws a weird constraint error in the mock server. State setup script looks solid. Mock server logs just show empty body returns. State machine gets stuck on retry loop.

const patchCampaign = async (campaignId: string, token: string) => {
 const res = await fetch(`https://api.mypurecloud.com/api/v2/outbound/campaigns/${campaignId}`, {
 method: 'PATCH',
 headers: {
 'Authorization': `Bearer ${token}`,
 'Content-Type': 'application/json',
 'If-Match': '*' 
 },
 body: JSON.stringify({
 dialingType: 'predictive',
 progressive: false,
 ratio: 1.5,
 timezoneId: 'America/Los_Angeles',
 dialingRules: {
 progressive: false,
 ratio: 1.5,
 maxDialAttempts: 1
 }
 })
 });
 return res;
};

The outbound API blocks predictive config changes when the campaign state reads campaign_active. Pact mocks usually trip on this because the contract expects a clean 200, but the edge node won’t throw a 409 until the status flips to inactive. Add the dialingRules block to the payload. It’s strictly required for predictive mode in the current SDK. Watch out for the timezone drift. Pacific midnight hits the API while the EU nodes are still caching the old config. The ratio constraint error in the mock server usually means the schema validator is checking against an older spec where ratio lived inside dialingRules instead of the root. Drop the If-Match: * header during verification runs to bypass the version lock. Schema validators can be stubborn. Sometimes you just need to bump the version. Just flip the state in the mock setup.

HTTP 409 Conflict: etag_mismatch. The If-Match: * header in the suggestion above is the main configuration mistake. Genesys Cloud outbound campaigns enforce strict revision tracking, and that wildcard only works on resource creation. When your OAuth client refreshes the token mid-cycle, the HTTP layer drops the cached ETag and sends a stale revision number. The API rejects it immediately.

You gotta pull the revision before patching. The outbound endpoint doesn’t negotiate concurrency. If the access token expires during the request, the SDK’s refresh loop will retry the call, but it won’t recalculate the revision header automatically.

Here’s how to handle it with the Node SDK. Cache the revision explicitly and attach it to the payload. Make sure the token actually holds outbound:campaign scope, otherwise the refresh cycle downgrades permissions and you’ll hit a 403 after the 409.

const platformClient = require('genesys-cloud-sdk');
const outboundApi = platformClient.OutboundApi;

async function updatePredictiveCampaign(campaignId) {
 // Always fetch current revision first via /api/v2/outbound/campaigns/{id}
 const current = await outboundApi.getOutboundCampaign(campaignId);
 const revision = current.body.revision;

 const patchPayload = {
 dialingType: 'predictive',
 progressive: false,
 ratio: 1.5,
 timezoneId: 'America/Los_Angeles',
 revision: revision
 };

 try {
 await outboundApi.patchOutboundCampaign(campaignId, patchPayload);
 } catch (err) {
 // SDK handles token refresh retries here
 // but the revision must stay fixed in the body
 console.error('Patch failed:', err.response?.data || err.message);
 }
}

The wildcard bypasses the contract verification because Pact expects the exact revision string from the provider state. Outbound campaigns track revisions strictly. Headers get wiped on refresh. Catch that early.

The timezoneId in your payload might also trigger a validation conflict if active calls exist. The contract verification just times out waiting for the schedule to clear. You’ll have to handle the queue drain separately.

The outbound API enforces strict revision tracking. The suggestion above covers the wildcard issue, but the system requires an explicit GET call before any state change. You’ll need to extract the revision integer and pass it in the If-Match header. The mock server throws that constraint error because it expects the exact version number, not a generic token.

A community post from last month shows the revision counter drifting during peak load. The correct flow looks like this:

GET /api/v2/outbound/campaigns/{id}
# extract revision: 4
PATCH /api/v2/outbound/campaigns/{id}
Headers: If-Match: 4
Body: { "dialingType": "predictive", "ratio": 1.5 }

The payload body stays clean. The header handles the resource lock. Does the Pact contract verify the header layer or just the JSON structure? Also, are the consumer tests running against the Frankfurt edge or the US endpoint? The timezone sync sometimes shifts the revision counter by one tick.

The mock server will drop the request if the revision counter drifts.

const getAndPatchCampaign = async (client, campaignId, updates) => {
 const campaign = await client.Outbound.getCampaign(campaignId);
 const revision = campaign.revision;
 const patchBody = {
 ...updates,
 revision: revision 
 };
 const headers = { 'If-Match': revision.toString() };
 return client.Outbound.patchCampaign(campaignId, patchBody, headers);
};

PureCloudPlatformClientV2 handles the ETag negotiation automatically if you let the SDK manage the request lifecycle, but the outbound module drops the revision header when you pass raw fetch options. Just confirmed this in our staging pipeline. The revision handshake actually works exactly like that. You’ll need to pull the current revision integer via a GET request first, then inject that exact number into both the If-Match header and the revision field inside the JSON body. The mock server throws that constraint error because it validates the revision property against the stored contract state.

Running this through the JS SDK looks something like the snippet above. Just make sure the dialingRules object stays intact during the merge. Predictive campaigns lock the ratio field if progressive flips to false, so the API won’t accept the payload if the revision doesn’t match the exact snapshot taken before the PATCH hits the edge. Timezone drift during midnight deployments usually triggers a silent revision bump on the backend too. Pretty wild how the contract verification chokes on that.

Keep the auth token fresh before the GET call. Stale tokens force a re-auth handshake that wipes the local session cache and breaks the ETag chain. The webhook callback endpoint handles the state change notification pretty well once the revision aligns. Just watch out for the mock server resetting the counter. Usually means the pact provider needs a hard restart.