Which of the following is not required for the electronic sale of methamphetamine precursors?

The electronic sale of methamphetamine precursors, such as pseudoephedrine, is governed by strict regulations to help monitor and control their availability due to their potential use in illegal drug manufacturing. One of the key requirements for such sales is to ensure the tracking of transactions and the identification of purchasers.

The correct choice highlights that while information about the purchaser's name, the seller's initials, and the date of purchase are all necessary elements for compliance, the specific mode of payment is not a required piece of information in the electronic sale record. This means that although payment details are essential for the transaction itself, they do not need to be documented in the same way as the other identifiers.

This emphasizes the importance of identifying both buyers and sellers in the prevention of illicit drug activities, while payment methods are seen as a separate concern that doesn't directly relate to monitoring purchases of regulated substances.