How to pass Invoice Custom Field into Simple Hosted Page

How to pass Invoice Custom Field into Simple Hosted Page

I've tried using different ways:

  1. ...url_copied_from_product_sub...?email=$email&cf_iccid=$iccid&ICCID=$iccid&custom_fields%5Bcf_iccid%5D=$iccid&custom_fields%5BICCID%5D=$iccid
email does prefil
but iccid doesn't appear in subscription

any tips?

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