Send OTP

  sendOtp(mobiles, message = null) {
    const params = [
      { key: 'authkey', value : process.env.SMS_API_KEY },
      { key: 'sender', value : process.env.SMS_SENDERID },
      { key: 'otp_length', value : 6 },
      { key: 'message', value : message || encodeURIComponent("Your verification code for Spectrum is ##OTP##.") },
      { key: 'mobile', value : mobiles }
    ];
    const queryParams = params.map( o => `${o.key}=${o.value}` );

    return axios.post(`http://control.msg91.com/api/sendotp.php?${queryParams.join('&')}`, params);
  }