Custom carrier tracking link, and variables

Hi guys, I added a custom carrier and when creating the tracking link I realized that the company I want to use needs 2 variables in the link: Tracking number, and CPF, which is the personal identification number here in Brazil.

In the AST plugin it offers these 3: %number%, %postal_code% and %country_code%

How can I add another custom variable to pull data from contact information?

Thank you very much for the guidance.
Guina.-

 

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