1. Look at the bar code of shoes: the fake bar code of shoes has several different thick and thin lines, while the bar code of genuine aj3 12 shoes is clearer, with only two thick and thin lines.

2. Look at the letters on the shoes: the letters on the fake shoes look messy. The letters of genuine aj3 12 shoes are evenly spaced, and the handwriting is particularly clear and symmetrical.

3. See if there is an invoice: aj3 12 sold in a regular shopping mall has a formal invoice, but fake shoes have no invoice.

4. Scan QR code: After you get aj3 12 shoes, you can scan the QR code on the box. After the genuine product is scanned, it will show that the fake product cannot be scanned.

5. Look at the toe cap: the toe cap of genuine aj3 12 shoes is more pointed, and the toe cap of fake aj3 12 shoes is more round.

6. Look at the leather of shoes: genuine aj3 12 shoes have good leather and are easy to wrinkle. Fake aj3 12 shoes have worse leather and are not easy to wrinkle.

According to the above methods, the authenticity of aj3 12 Vanilla Yellow can be identified.