https://blog.canopas.com/integrate-google-recaptcha-enterprise-using-vue-js-and-golang-60a9335e80ac - recaptcha-verification

reCaptcha-verification.go

func VerifyRecaptcha(token string) (bool, error) {

    ctx := context.Background()

    /** convert base64 formetted JSON to bytearray */
    credBytes, err := b64.StdEncoding.DecodeString(os.Getenv("JSON_BASE64"))
    if err != nil {
      return false, err
    }

    /** create reCaptcha client with JSON bytearray */
    client, err := recaptcha.NewClient(ctx, option.WithCredentialsJSON(credBytes))
    if err != nil {
      return false, err
    }

    /** close client when it's done */
    defer client.Close()

    /** create the assessment request */
    request := &recaptchapb.CreateAssessmentRequest{
      Assessment: &recaptchapb.Assessment{
        Event: &recaptchapb.Event{
          Token:   token,
          SiteKey: os.Getenv("RECAPTCHA_SITE_KEY"),
        },
      },
      Parent: fmt.Sprintf("projects/%s", os.Getenv("RECAPTCHA_PROJECT_ID")),
    }

    /** create assessment */
    response, err := client.CreateAssessment(ctx, request)

    if err != nil {
      return false, err
    }

    /** Interpret and verify assessment response */
    if response.TokenProperties.Action == "verify" && response.TokenProperties.Valid && response.RiskAnalysis.Score >= 0.9 {
      return true, nil
    }

    return false, nil
}