Decode Base64 In Custom Field When Sending Emails

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I’m saving base64 encoded html in a custom field via the API. I’m looking to add the custom field to a email template and it decode the Base64 when sending emails.

This extension https://github.com/mtcextendee/mautic-custom-tags-bundle seems to be what i’m looking for, but the author said he will not be upgrading it to M3.

I have this working when sending emails via a API by adding a prefix to the base64 string…

case “cb64de://”:
$value = base64_decode(substr($value, 9));

But cant seem to find where to hack the code for sending email via a template.

Any help is appreciated!

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