how can we get the access token using this package because I can't under where I will get the AuthCode

const authCode = '123' // replace valid authCode here const params = { code: authCode, } const response = aLazadaAPI .generateAccessToken(params) .then(response => console.log(JSON.stringify(response, null, 4))) .catch(error => console.log(JSON.stringify(error, null, 4)))