There was once a huge push behind contactless payment cards in the U.S., but eventually issuers lost interest in the format. However, there are signs that contactless payments will make another push.

Citigroup customers can now dispute credit card charges through its app, one of several mobile enhancements the company rolled out Wednesday.

Issuers are watching the consumer response to Citi’s rollout of its cobranded Costco card, which is the largest U.S. portfolio of EMV cards that are also NFC-enabled.