Simulate a full third-party login flow with ECDH-encrypted token decryption.
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MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg84+SQywa5jF4RtNCSvG0PRW1/Yc5MeCJyf1P0v6wPJihRANCAAQhwAhXjHNdk672m6PZpJK+vHlHZGO5NfrggMouO8NucFk2RAYFK9AbZ/VeILCW3Lfh+9d084M5GX8gJVPYiGqB
Popup Window (postMessage) - More secure, uses window.open