Simulate a full third-party login flow with ECDH-encrypted token decryption.
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MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgnn7JPUuDXY/H5cKEMtHzzveD2a97/fy+JGx97sTJ94+hRANCAAT+CV1pI+2r9QipaDa5BatTu5GrKo7kMwzMAj9do+Lu/1djnNRyYrM5APf3KeEslUTYJ5VYGinFP8DTQzYBTimH
Popup Window (postMessage) - More secure, uses window.open