Double opt-in occurs when
|“||a user has elected to receive an e-mail newsletter or stand-alone commercial message. A confirmation e-mail is then sent to the user to which he/she must reply (either by replying to the message or clicking on a URL contained within) before the list owner may add them to their list.||”|
Double opt-in is a
|“||process that requires consumers to take two separate steps to authorize a third-party charge, one of which is intended to confirm that the consumer is in physical possession of a phone tied to the account that will be charged.||”|
"Common forms of double opt-in include:
- Mobile phone opt-in — a consumer sends a text message with a keyword to a short code, receives a confirmation text, and then sends a second text message to confirm the transaction;
- Web opt-in — a consumer first enters his or her number on a website, then receives a text with a PIN, which the consumers enters back into the website;
- WAP (wireless access protocol) — a consumer responds to an offer on his or her phone ([[display]ed through the mobile web), and clicks on a confirmation button on the phone two separate times; and
- IVR (interactive voice response) — a consumer opts-in over the phone through a toll-free number and confirms the transaction twice."
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