You can purchase a FASTag online or can visit your bank provided it offers the best FASTag services. The other best option is to purchase a FASTag at any highway toll plaza you come across or from the Indian Highway Management Company Ltd (IHMCL), which sells bank-neutral FASTags and gives users the choice of how to pay. No matter where you purchase from, you need to submit the following documents to get a FASTag- Vehicle Registration Certificate, Passport size photo, Aadhaar Card, and any other KYC document for Identification and Address proof.