You are able to assign up to three custom values to a partner. Once the custom values are assigned, you are then able to add the values to your landing page query string. Assigning custom values to your partner helps:
Identify the partner by name in your internal analytics dashboard.
Specify the type of traffic associated with the partner (e.g. paid search, email, loyalty, coupon, toolbar, etc.).
Track if you have worked with the partner through another network and want to be able to marry the data and assign the Partner ID from the other network.
In the left navigation menu, select
[Engage] → Partners → Partners.Alternatively, for Creator programs, select
[Engage] → Partners → Creators.
Hover over the partner for whom you want to set custom values and select
[More] → Tracking → Custom Values.
Select
[Edit] to the far right of the Partner Value field you want to set.Up to three values can be set.
Input a value and select Save.
To view all your existing Partner Custom Values, select
[Menu] → Settings → Partner Custom values.
Note: Partner Custom Values correspond to the {mp_value1} dynamic value of the Landing Page Query String Parameters. See Gateway Tracking Templates for more context.
Partner custom values can also be uploaded and configured in bulk with a .XLSX or .CSV file.
In the left navigation menu, select
[Engage] → Partners → Partners.Alternatively, for Creator programs, select
[Engage] → Partners → Creators and in the upper-right, select 
[More] → Revert to old UI.
In the upper-right, select Bulk Edit.
Select Choose file and upload a file with all of your custom values.
Select Show/hide file format details to learn more about the required file format.
You can also select Copy columns to clipboard and paste the template into a spreadsheet.
Select Next.
The data will load onto the Partner Values Bulk Upload screen with all the Partner Ids and custom values you've listed.
Here you can view validation errors, download the error file, and filter to show only errors or passing values.
Select Accept & Create Partner Custom Values.
To set your partner values to the landing page query string:
From the left navigation menu, select
[Menu] → Settings.Under the Tracking section, select Gateway.
To the far right of the Partner Tracking Template field, select
[Edit].
[Toggle on] Automatically append query string parameters to all landing pages for Partners.This option allows you to ensure that certain query string parameters will always be added to the landing page for all redirected referrals from a partner. This is primarily useful if you use a third-party analytics tool and wish to pass information to them through a query string parameter.
Enter the name and custom value in the blocks provided.
See Gateway Tracking Templates for more information.
Select Save.
