Simulate a full third-party login flow with ECDH-encrypted token decryption.
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MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgio45v905VQ9xRldUhdTTliEwjWaa2kadMLt7hMUYvZihRANCAATT8pYmDCIngUsozOgp5delzCMrfCxBfX+W/ZbmHvfhxzfmK5HebD8tRqG1Wn3D6CMYdlf7josGlgnktsNWZNkE
Popup Window (postMessage) - More secure, uses window.open