Mumbai, Aug. 26 -- If you are a State Bank of India (SBI) customer, get ready to pay for your groceries using keychains. That's what India's largest lender wants to try out.

While payments have moved much ahead of just plastic cards, mobile phones and watches, SBI wants to push the bar for digital transactions through wearable devices.

The state-owned bank has sought bids to support its foray into wearable payment technologies and for personalizing and upgrading debit cards, according to a document seen byMint. Apart from using the keychain, the bank also wants to try out NFC (near-field communication) stickers and silicon bands, among others. The bank, the document showed, wants proposals from interested bidders to offer solutions that...