https://whatsappbusiness.com/products/conversation-categories/authentication/
WhatsApp Authentication Messages | Securely verify your customers
Apr 30, 2026 - Build trust with WhatsApp authentication. Streamline real-time verification via one-time passcodes to help secure user accounts and transactions.
authentication messagesyour customerswhatsappsecurelyverify
https://www.epo.org/fr/boards-of-appeal/decisions/t230454eu1
T 0454/23 (Authentication messages for hearing devices/GN HEARING) du 11.02.2025
authentication messageshearing devicesgndu
https://git.taler.net/taler/challenger/refs.html
Refs - challenger - OAuth 2.0-based authentication service that validates user can receive messages...
authentication servicerefschallengeroauthbased
https://docs.pingidentity.com/pingfederate/12.1/administrators_reference_guide/pf_config_back_channel_auth_inbound_messag.html
Configuring back-channel authentication for inbound messages | PingFederate Server
You can add and edit configuration settings for back-channel authentication for inbound messages.
configuringbackchannelauthenticationinbound