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Use environment variables for agents and CI: 
export FIRSTSALES_API_KEY="fs_..."
export FIRSTSALES_BASE_URL="https://api.app.firstsales.io"
Or pass flags: 
firstsales whoami --api-key "$FIRSTSALES_API_KEY" --base-url https://api.app.firstsales.io
The CLI supports local profiles for developer machines. Environment variables are preferred for automation because they are explicit and easier to rotate.