> For the complete documentation index, see [llms.txt](https://docs.exads.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exads.com/api/conversion-tracking-api.md).

# Conversion Tracking API

## Conversion Tracking API Overview

The Conversion Tracking API tracks the conversion of [goals](/advertisers/campaigns/conversion-tracking.md) such as reaching a landing page, subscription, or sign-up.

## Request <a href="#request" id="request"></a>

The request is an HTTP GET request as follows:

```
http://syndication.example.com/tag.php?goal=1b9b3786eae526755467c2593d194005&tag={conversions_tracking}&skey=1234567&cpa=0.1
```

| Parameter  | Description                                                                                                            |
| ---------- | ---------------------------------------------------------------------------------------------------------------------- |
| Goal       | The Goal ID as created in the Admin Panel, e.g. 1b9b3786eae526755467c2593d194005                                       |
| Tag        | A data object generated by EXADS and usually replaced in the click URL through the {conversions\_tracking} token       |
| CPA/skey\* | A numeric value defining the CPA bid at runtime + skey (an account-specific secret key provided by the EXADS platform) |

\*only if CPA is enabled

## Response <a href="#response" id="response"></a>

The response is either "OK" or one of the errors below:

<table data-header-hidden="false" data-header-sticky data-search="false"><thead><tr><th>Response</th><th>Meaning</th></tr></thead><tbody><tr><td>OK</td><td>The request is OK</td></tr><tr><td>ERROR: This conversion has already been notified and saved.</td><td>A conversion goal for this conversions_tracking ID (tag) has already been registered within the last 24 hours</td></tr><tr><td>ERROR: Tag is invalid!</td><td>The format of the ID (tag) is not correct</td></tr><tr><td>ERROR: No tag data.</td><td>The tag or conversions_tracking ID is missing</td></tr><tr><td>ERROR: Goal ID is invalid.</td><td>The format of the Goal ID is not correct. Goal IDs are 32 characters of hexadecimal (0-9, a-f)</td></tr><tr><td>ERROR: No Goal ID.</td><td>The tag or Goal ID is missing</td></tr><tr><td>ERROR : Goal value is invalid.</td><td>The format of Goal value should be a monetary number</td></tr></tbody></table>

If the network has CPA enabled, there may also be these additional responses:

| Response                      | Meaning                                                                                                                                      |
| ----------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
| ERROR: Price is invalid.      | The Value of the CPA price parameter is invalid. This should be a value between 0 and 100 (inclusive)                                        |
| ERROR: Secret key is invalid. | The secret key provided is incorrect. Your secret key can be found under **Campaigns** > **Conversion Tracking** at the bottom of the screen |

## Error Examples <a href="#error-examples" id="error-examples"></a>

### ERROR: Tag is invalid! <a href="#error-tag-is-invalid" id="error-tag-is-invalid"></a>

```
http://syndication.examplesite.com/tag.php?goal=1b9b3786eae526755467c2593d194005&tag=123456789
```

### ERROR: No tag data. <a href="#error-no-tag-data" id="error-no-tag-data"></a>

```
http://syndication.examplesite.com/tag.php?goal=1a76578475674857&tag=
```

### ERROR: Goal ID is invalid. <a href="#error-goal-id-is-invalid" id="error-goal-id-is-invalid"></a>

```
http://syndication.examplesite.com/tag.php?goal=4564&tag={conversions_tracking}
```

### ERROR: No Goal ID. <a href="#error-no-goal-id" id="error-no-goal-id"></a>

```
http://syndication.examplesite.com/tag.php?goal=&tag={conversions_tracking}
```

### ERROR: Goal value is invalid. <a href="#error-goal-value-is-invalid" id="error-goal-value-is-invalid"></a>

```
http://syndication.examplesite.com/tag.php?goal=c10a67e8bce7a35bcd9bb5a519f4b2b7&value=10
```

<br>


---

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```
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