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# AutoBill.fetchUpgradeHistoryByMerchantAutoBillId

The `fetchUpgradeHistoryByMerchantAutoBillId` method returns the specified AutoBill’s upgrade history given the `merchantAutoBillId.`

## Input

*srd*: sparse response description, a SOAP string (which must be a JSON object), in which you specify the elements you want returned.This parameter enables the calling system to constrain a `method` call to return only components you specify. This gives you greater control over returned content, and improves response time within the Vindicia platform by reducing the processing needed for the call.

Some fields are required, either practically or in the WSDL, and will be returned regardless of the *srd*. A null *srd* returns the complete response.

*merchantAutoBillId*: the ID for any item in the AutoBill's upgrade history for which you want the entire history series.

## Output

*return*: an object of type `Return` that indicates the success or failure of the call.

*upgradeHistorySteps*: produces an array of steps or revisions in the AutoBill’s history. The `AutoBillUpgradeHistoryStep` object contains

* `vid`: the Vindicia ID for the object,
* `startTimestamp`: the date and time the step began, and
* `endTimestamp`: the date and time the step ended. This time stamp is omitted if the step is current.

## Returns

This method returns the codes listed in [The Return Object](The_Return_Object).

## Example

See [AutoBill.fetchUpgradeHistoryByVid](AutoBill_fetchUpgradeHis_1) for an example of how to process the return parameters.

**Parent topic:**[AutoBill Methods](../topics/AutoBill_Methods)


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