service.go

package api

import (
    "github.com/twilio/twilio-go"
    twilioApi "github.com/twilio/twilio-go/rest/verify/v2"
)

var client *twilio.RestClient = twilio.NewRestClientWithParams(twilio.ClientParams{
    Username: envACCOUNTSID(),
    Password: envAUTHTOKEN(),
})

func (app *Config) twilioSendOTP(phoneNumber string) (string, error) {
    params := &twilioApi.CreateVerificationParams{}
    params.SetTo(phoneNumber)
    params.SetChannel("sms")

    resp, err := client.VerifyV2.CreateVerification(envSERVICESID(), params)
    if err != nil {
        return "", err
    }

    return *resp.Sid, nil
}

func (app *Config) twilioVerifyOTP(phoneNumber string, code string) error {
    params := &twilioApi.CreateVerificationCheckParams{}
    params.SetTo(phoneNumber)
    params.SetCode(code)

    resp, err := client.VerifyV2.CreateVerificationCheck(envSERVICESID(), params)
    if err != nil {
        return err
    } else if *resp.Status == "approved" {
        return nil
    }

    return nil
}