[<button style="margin-top:15px">Help me build a query</button>](https://developers.google.com/google-ads/api/fields/v26/ad_parameter_query_builder) [<button style="margin-top:15px">Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)</button>](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/resources/ad_parameter.proto)

An ad parameter that is used to update numeric values (such as prices or
inventory levels) in any text line of an ad (including URLs). There can
be a maximum of two AdParameters per ad group criterion. (One with
parameter_index = 1 and one with parameter_index = 2.)
In the ad the parameters are referenced by a placeholder of the form
"{param#:value}". For example, "{param1:$17}"

| Attributed resources |
|---|
| [ad_group](https://developers.google.com/google-ads/api/fields/v26/ad_group) |
| [ad_group_criterion](https://developers.google.com/google-ads/api/fields/v26/ad_group_criterion) |
| [campaign](https://developers.google.com/google-ads/api/fields/v26/campaign) |
| [customer](https://developers.google.com/google-ads/api/fields/v26/customer) |

Fields from the above resources may be selected along with this
resource in your SELECT and WHERE clauses. These fields **will not segment**
metrics in your `SELECT` clause.

## ad_parameter.ad_group_criterion

Field descriptionImmutable. The ad group criterion that this ad parameter belongs to.
Category`ATTRIBUTE` Data Type`RESOURCE_NAME` Type URL`N/A` FilterableTrue SelectableTrue SortableFalse RepeatedFalse Selectable with The following fields/resources can be selected with this field:
[ad_parameter](https://developers.google.com/google-ads/api/fields/v26/ad_parameter)

## ad_parameter.insertion_text

Field descriptionNumeric value to insert into the ad text. The following restrictions
apply:

- Can use comma or period as a separator, with an optional period or
  comma (respectively) for fractional values. For example, 1,000,000.00
  and 2.000.000,10 are valid.

- Can be prepended or appended with a currency symbol. For example,
  $99.99 is valid.

- Can be prepended or appended with a currency code. For example, 99.99USD
  and EUR200 are valid.

- Can use '%'. For example, 1.0% and 1,0% are valid.

- Can use plus or minus. For example, -10.99 and 25+ are valid.
- Can use '/' between two numbers. For example 4/1 and 0.95/0.45 are valid.
Category`ATTRIBUTE` Data Type`STRING` Type URL`N/A` FilterableTrue SelectableTrue SortableTrue RepeatedFalse Selectable with The following fields/resources can be selected with this field:
[ad_parameter](https://developers.google.com/google-ads/api/fields/v26/ad_parameter)

## ad_parameter.parameter_index

Field descriptionImmutable. The unique index of this ad parameter. Must be either 1 or 2.
Category`ATTRIBUTE` Data Type`INT64` Type URL`N/A` FilterableTrue SelectableTrue SortableTrue RepeatedFalse Selectable with The following fields/resources can be selected with this field:
[ad_parameter](https://developers.google.com/google-ads/api/fields/v26/ad_parameter)

## ad_parameter.resource_name

Field descriptionImmutable. The resource name of the ad parameter.
Ad parameter resource names have the form:

`customers/{customer_id}/adParameters/{ad_group_id}~{criterion_id}~{parameter_index}`
Category`ATTRIBUTE` Data Type`RESOURCE_NAME` Type URL`N/A` FilterableTrue SelectableTrue SortableFalse RepeatedFalse Selectable with The following fields/resources can be selected with this field:
[ad_parameter](https://developers.google.com/google-ads/api/fields/v26/ad_parameter)