SparkPost import contact WITH CUSTOM FIELDS & TAGS NOT JUST NAME & EMAILS (3 LIST)

I have 3 list of clients I need to import into SparkPost (Port25 Email Service), BUT I HAVE CUSTOM FIELDS I need to import into the db.

Here are a few different articles regarding substitution data,advanced email templates, and more:

Substitution References

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Advanced email templates

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Cascading Data with Substitution Data

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Leveraging Substitution Data and Templates to Personalize Emails

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Projekt-id: #15767677

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