The Additional Response Fields tab allows you to add custom variables at the Product level. You can create variables for customers using short, intuitive names.
You can add attributes for specific internal use cases, as well as their response keys that can be utilized for API integrations or Publisher’s forms.
To access, go to the System Management > Products section, select the Product from the list, and click the “Settings” button in the “Actions” column. On the Product Setup page, click the “Additional Response Fields” tab.
The “Product Additional Attributes” subtab allows you to add variables for special use cases when a custom field is needed for API mapping, Publisher forms, or other internal configurations.
The list of available variables contains the following information:
- ID: The number of the variable in the list.
- Name: The name of the variable.
- Short Name: The short name of the variable.
To add a new custom variable, click the “Add New Attribute” button. In the pop-up window, fill in the name of the variable and its short name and click the “Save” button.
Once you have created the attribute, it will be displayed as a hint throughout the system among other existing placeholders. 
To further configure what information is pulled using the Product attribute placeholders, enter the data into the Campaign Additional Attributes fields via the Campaign Configuration page. Read more about the Campaign Additional Attributes in this Knowledge Base article.
To edit the existing attribute, click the “Edit” button in the “Actions” column.
To remove the attribute from the Product, click the “Delete” button in the “Actions” column.
The “Response Customization” subtab allows you to add and configure the additional response fields that can be used for the API and Publisher’s forms as well as to configure the existing custom Product attributes even further.
The list of existing custom response fields contains the following information:
- Name: The name of the response field.
- Type: The type of the response field.
- Description: The response field’s description.
- Is Active: The indication if the response field is active or not.
To add a new response field, click the “Add New Response Field” button. Fill in the following fields in the pop-up window:
- Name: Enter the name of the response field.
- Description: Enter the response field’s description.
- Type: Select the level at which the field will be displayed (Per Campaign / Per Leg).
- Default Value: Enter the response field’s default value. Click the “Show available placeholders” link to view the existing variables you can use.
- Example for API: Enter the field’s value example.
- Hide field if Value is empty: Select the “Yes” option to hide the field from the response if its value is empty.
- Method: Select one of the preferable methods (POST / FORM).
- Add field for: Select the preferred processing stage (PING / POST / FULLPOST). Note: For the Ping Post Products select both Ping and Post.
- Return field on: Select whether you want to return the field on Accept, Reject, or both.
- Is Active: Select the “Yes” option to enable the response field.
Click the “Add” button to confirm.
To edit the existing response field, click the “Edit” button in the “Actions” column.
To remove the response field from the Product, click the “Delete” button in the “Actions” column.