How can one prevent from signing multiple times on a petition? In other words, how can we authenticate a signature?
You can enable User Verify Email and Force Verify Email setting from Campoal > Email.
This setting will required user verify their email before add signature to petition. If new user sign a petition, it will save on pending signature list, until email verifed the signature will be add to petition from pending list.
The sign button also disabled if email still not verify.
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