Last 4 digits of the card number:
Go to Settings → Custom Value and create a new custom value (e.g., First_Name_Fallback).
Set Up If/Else condition in the Workflow to check if the original field (e.g., First Name) is empty.
Insert the fallback value into message
If the field is empty, use the fallback Custom Value (e.g., "there") directly in the copy of your message.
If the field has a value, use the regular merge field (e.g., ).
Click here for more information on using If/Else in workflows

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