Visa Releases MPP Card Spec, SDK, and CLI Tool — AI Agents Can Now Make Programmatic Card Payments Without Storing API Keys

PYMNTS·high signal

Visa announced on March 18 that it is extending the Machine Payments Protocol to its global card network, releasing an SDK with tokenization, authentication, and agent identity verification built in. A separate Visa Crypto Labs product — Visa CLI — lets AI agents execute card payments directly from the command line without developers storing or managing API keys. This gives autonomous agents a native, secure path into the $16T+ card payment rail, removing the last major friction point for AI-to-merchant commerce at scale.