NEW DELHI (Financial Times) — India’s central bank has ordered Mastercard to stop adding new customers for failing to comply with the country’s data storage rules, escalating a dispute between Indian authorities and U.S. financial services groups over the control of customer data.

The Reserve Bank of India said Mastercard had not complied with rules introduced in 2018 that bar payment companies from transferring customer data overseas. The regulations, which were fiercely resisted by U.S. payment companies, required all financial data to be stored exclusively in India.

The central bank said Mastercard’s failure to meet the requirements came “notwithstanding lapse of considerable time and adequate opportunities being given.” Its order comes into effect July 22 and does not affect existing customers.

It imposed similar restrictions on American Express in April. The bans could be costly for U.S. payment groups, which risk missing out on the roaring growth of non-cash payments as India’s government pushes to expand access to financial services among its population of 1.4 billion.

India’s data localization policies, which are part of a global trend by governments to expand oversight of their citizens’ data, have already proved a source of trade tension with the U.S. The U.S. trade representative under then-President Donald Trump criticized India’s data storage rules as “discriminatory and trade-distortive.”

Mastercard said it was “fully committed to our legal and regulatory obligations in the markets we operate in” and to resolving the RBI’s concerns.

The central bank order comes as Indian authorities reassess more broadly the power and freedom U.S. companies can exercise in the economy, particularly tech businesses.

Prime Minister Narendra Modi’s government has, for example, engaged in a protracted standoff with companies such as Twitter and Facebook over subjects such as the removal of posts and encryption. It introduced tough new rules for social media companies in May.

The RBI has long kept a tight leash on foreign participants in India’s financial sector, but its data storage rules prompted an outcry and furious lobbying when they were introduced in 2018.

U.S. payment companies argued that they would push up costs, undermine data security and were imposed too hastily to implement. In its order on Wednesday, the RBI did not specify how Mastercard had failed to comply.

Moving from cash to online payments was a policy priority for the Indian government even before the pandemic.

The National Payments Corporation of India, which was set up by the RBI and is owned by a consortium of Indian lenders, has launched several initiatives designed to expand access to financial services. These include RuPay, which has issued more than 600 million cards, and the UPI mobile payments system, which has had rapid growth during the pandemic.

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