Walmart has tightened its links with the financial services company that handles its pre-paid MoneyCard business.

The world’s largest retailer and Asda owner has taken a minority stake in Green Dot, a US financial business that is looking to move into banking.

The deal comes after Walmart and Green Dot extended their partnership to 2015, according to the Financial Times.

Walmart claims billions of dollars have been paid into its MoneyCards, which can be used to make purchases at the retailer’s stores. It also makes payments to many of its staff via the cards.

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