(registering a `wg` generated public key with CF)

    api=https://api.cloudflareclient.com/v0i1909051800
    ins() { vrb=$1; shift; curl -s -H 'user-agent:' -H 'content-type: application/json' -X "${vrb}" "${api}/$@"; }
    sec() { ins "$@" -H 'authorization: Bearer '"${reg[1]}"''; }

    cfg=($(if [[ -e "${usr}" ]]; then
        reg=($(cat "${usr}"))
        test "${#reg[@]}" -eq 2
        sec GET "reg/${reg[0]}"
    else
        reg=($(ins POST "reg" -d '{"install_id":"","tos":"'"$(date -u +%FT%T.000Z)"'","key":"'"${pub}"'","fcm_token":"","type":"ios","locale":"en_US"}' |
            jq -r '.result|.id+" "+.token'))
        test "${#reg[@]}" -eq 2
        echo "${reg[@]}" >"${usr}"
        sec PATCH "reg/${reg[0]}" -d '{"warp_enabled":true}'
    fi | jq -r '.result.config|(.peers[0]|.public_key+" "+.endpoint.v4)+" "+.interface.addresses.v4'))
    test "${#cfg[@]}" -eq 3