Getting the Brazilian CPF/CNPJ on payment request

I’m integrating a new Payment App to Shopify. While on the payment request flow, In Brazil, this Tax ID number are unique and required, called CPF (or CNPJ for companies).

I would like to get the customer payload object and add this information that I insert on the Shopify checkout to insert the customer on my dashboard.

How can I do it? Should I consume it from a specific API?

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I did it with the GraphQL API, just as VBlancoPR described in this topic.