British-based financial technology company Revolut has warned customers over a potential no-deal Brexit.

The firm was started back in 2015, with a view that money should be borderless.

It offers global spending and transfers without exchange rates.

The company received its banking licence in December last year, and has also been granted an Electronic Money License in the European Union.

It said it "may need to migrate" customers over to this in the near future.

More than four million people now use its services - including some 250,000 Irish users.

In an e-mail to customers, it has asked them to upload new ID documents.

It said: "Right now, all of our customers in Europe are tied to our UK Electronic Money License, which we have passported across the European Economic Area.

"If a no deal outcome were to happen, we would no longer be able to passport this licence across Europe."

In instructions to its users, it added that in the event that it needs to migrate them over to its EU-based license, they would need to upload a different form of ID.

"Unfortunately, this EU-based licence does not recognise a driving licence as a valid form of ID", the company said.

The firm also made headlines earlier this month, after customers experienced technical issues while trying to access services.

Its chief financial officer Peter O'Higgins, who joined the digital bank in 2016 after 12 years at JP Morgan, resigned at the start of the year.