Bing (Microsoft Ads) Conversions

This guide covers how to submit offline conversions to Microsoft Advertising (Bing) through the TNT Growth API.

Authentication

All requests require an x-api-key header with your client-specific API key provided by TNT Growth.

-H "x-api-key: YOUR_API_KEY"

Submitting a Conversion

Endpoint

POST /api/bing/conversions/offline/add

Request Body Schema

Field	Type	Required	Description
customerAccountId	string	Yes	Your Microsoft Ads customer account ID (provided during onboarding)
conversionName	string	Yes	The name of the offline conversion goal in Microsoft Ads
microsoftClickId	string	Conditional	Microsoft Click ID (msclkid) captured from the ad click. Optional when you send email or phoneNumber for enhanced conversions.
conversionTime	number	Yes	Unix timestamp (seconds) of when the conversion occurred
conversionValue	number	No	Monetary value of the conversion
email	string	Conditional	Customer email address (hashed before sending to Microsoft). Enables enhanced conversions and can substitute for microsoftClickId.
phoneNumber	string	Conditional	Customer phone number (hashed before sending to Microsoft). Enables enhanced conversions and can substitute for microsoftClickId.
ingestionSource	string	No	Origin of the event (e.g. pixel, conversion-api)
tntId	string	No	The attribution handle from the pixel. A resolved session fills microsoftClickId and any missing UTM fields
utmSource	string	No	UTM source parameter (e.g. bing) — stored for attribution reporting, and also decides delivery when it names a different paid platform. See When we withhold a conversion
utmMedium	string	No	UTM medium parameter (e.g. cpc) — stored for attribution reporting
utmCampaign	string	No	UTM campaign name — stored for attribution reporting
utmTerm	string	No	UTM search keyword — stored for attribution reporting
utmContent	string	No	UTM content parameter (ad/creative variant) — stored for attribution reporting

At least one identifier is required

Provide at least one of microsoftClickId, email, or phoneNumber. A request with none of these is rejected with 400 Bad Request — Microsoft has nothing to attribute the conversion to.

Example Request

curl -X POST https://flex.tntgrowth.io/api/bing/conversions/offline/add \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "customerAccountId": "B012345678",
    "conversionName": "Offline Purchase",
    "microsoftClickId": "abc123def456ghi789",
    "conversionTime": 1778043599,
    "conversionValue": 150,
    "email": "customer@example.com",
    "phoneNumber": "+15551234567",
    "tntId": "9f2b7c1e-4d3a-4f8b-9c2e-1a5d7e0b4c63",
    "utmSource": "bing",
    "utmMedium": "cpc",
    "utmCampaign": "brand-search-q2",
    "utmTerm": "best treatment center",
    "utmContent": "expanded-text-ad-variant-b"
  }'

Example Response

{
  "message": "Offline conversion sent to bing Example Client B012345678 Offline Purchase",
  "data": {
    "submissionId": "8f3c2d10-7e6b-4a51-9d8c-3b2e1f0a9b8c",
    "duplicate": false
  }
}

When a conversion is dedup-skipped (the same event was submitted within the last 24 hours), submissionId is null and duplicate is true.

Checking Submission Status

After submitting a conversion, use the submission ID to check processing status.

Endpoint

GET /api/conversions/submissions/:submissionId

Example Request

curl https://flex.tntgrowth.io/api/conversions/submissions/8f3c2d10-7e6b-4a51-9d8c-3b2e1f0a9b8c \
  -H "x-api-key: YOUR_API_KEY"

Example Response

{
  "id": "8f3c2d10-7e6b-4a51-9d8c-3b2e1f0a9b8c",
  "source": "BING",
  "externalAccountId": "B012345678",
  "expectedCount": 1,
  "createdAt": "2026-05-11T12:00:00.000Z",
  "scheduledFor": null,
  "counts": {
    "success": 1,
    "failed": 0
  },
  "status": "complete"
}

Status Values

Status	Description
pending	Conversion is queued and waiting to be processed
pending_delivery	Submission is scheduled for future delivery. Currently only emitted by Google Ads ingest paths; Bing submissions never enter this state.
complete	Every conversion reached a final outcome and none was rejected. Usually means all were delivered — but a withheld conversion also finishes here, so compare counts.success with expectedCount if you need delivery confirmed
complete_with_errors	Processing finished but some conversions failed — use GET /api/conversions/bing/failed?submissionId=<id> to fetch the actual error messages
stalled	Processing has not progressed — contact support

Withheld Conversions

A conversion is withheld when its attribution says another paid channel served the click — a utmSource naming a different platform, with no Microsoft Ads click ID beside it. Uploading it would train Microsoft Ads's bidding on traffic Microsoft Ads never sent, so we hold it back instead. The full rules, and the utm_source values that count as a claim, are in When we withhold a conversion from a platform.

When TNT Growth has set your account to send Bing only click-attributed conversions, a conversion with no microsoftClickId is withheld as well, including an email- or phone-only match, whatever its utmSource. Those entries carry "reason": "click_id_required" and no claimedPlatform.

This is not an error. A withheld pair appears in counts.withheld, is excluded from counts.success, and never counts as failed — failed means the platform rejected it. A submission whose only non-delivered pairs were withheld finishes as complete, so compare counts.success with expectedCount if you need delivery confirmed.

{
  "expectedCount": 2,
  "counts": {
    "success": 1,
    "failed": 0,
    "withheld": 1
  },
  "withheld": [
    {
      "reason": "cross_channel",
      "claimedPlatform": "google",
      "count": 1
    }
  ],
  "status": "complete"
}

Both counts.withheld and the withheld array are present only when something was withheld, so a submission with nothing withheld returns exactly the shape it always has. Each entry carries reason (cross_channel, click_id_required, or other for a reason not documented here), claimedPlatform on cross_channel entries only (google, meta, bing, tiktok, linkedin, reddit or openai), and count; the entries sum to counts.withheld. Nothing is discarded — the payload is kept, so a withheld conversion can still be delivered later if your tagging or the rules change. Re-sending the same payload will be withheld again; send the Microsoft Ads click ID and it is delivered, whatever utmSource says.

The scheduledFor field is always null for Bing submissions and is included only for schema parity with Google Ads, which uses it for deferred delivery.

Inspecting Failed Conversions In Your Batch

When a submission ends with complete_with_errors, the submission status endpoint surfaces only the count of failed rows. Fetch the actual error messages with:

GET /api/conversions/bing/failed?submissionId=<submissionId>

The response payload mirrors the Google Ads failed-conversion shape — see Google Ads → Inspecting Failed Conversions In Your Batch.

Enhanced Conversions

Microsoft treats the msclkid as optional when you supply a hashed email or phone number — the same idea as Google Enhanced Conversions. This lets you attribute conversions where the click ID wasn't captured (e.g. a phone lead), using the customer's identifiers instead.

How attribution is chosen per conversion:

You send	Attributed by
microsoftClickId only	Click ID
email / phoneNumber only (no microsoftClickId)	Enhanced (hashed identifiers)
Both	Click ID, with hashed identifiers attached to improve match rate

email and phoneNumber are always hashed on our servers before they leave (SHA-256 email, E.164 phone) — raw values are never sent to Microsoft.

Enable enhanced conversions in Microsoft Ads first

Hashed identifiers only match if enhanced conversions are enabled on the offline conversion goal in your Microsoft Advertising account. After enabling it, allow a couple of hours before relying on enhanced-only attribution. See Microsoft's OfflineConversion reference.

Example: enhanced conversion (no click ID)

curl -X POST https://flex.tntgrowth.io/api/bing/conversions/offline/add \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "customerAccountId": "B012345678",
    "conversionName": "Offline Purchase",
    "conversionTime": 1778043599,
    "conversionValue": 150,
    "email": "customer@example.com",
    "phoneNumber": "+15551234567"
  }'

Best Practices

• Include microsoftClickId when you have it — the msclkid gives Microsoft the most reliable attribution to the originating click. When it isn't available, send email/phoneNumber so the conversion can still be attributed via enhanced conversions
• Use accurate timestamps — conversionTime should reflect when the conversion actually occurred; Microsoft rejects conversions older than its lookback window
• Size the goal's conversion window for your sales cycle — Microsoft also rejects a conversion whose click happened longer before conversionTime than the goal's conversion window (set per goal in Microsoft Ads, up to 90 days). These rejections are final and are not retried, so widen the window before sending conversions that close weeks after the click
• Match conversionName exactly to the offline conversion goal configured in Microsoft Ads
• Send email and/or phoneNumber to enable enhanced conversion matching (and to raise match rate even when a microsoftClickId is present)
• Poll with a delay — wait 30-60 seconds after submission before checking status
• Send tntId when your backend has it — the attribution handle recovers the click ID and UTMs captured on the visitor's original ad click, which is often the only thing that attributes an offline conversion at all