The offer, which is 28 percent above the company's closing share price on Tuesday, is at a discount compared with PayPal's valuation a year ago. There are no signs that the payment services company intends to accept the offer.
So far, PayPal has been reluctant to do business with these two players, according to the Financial Times, which cites knowledgeable sources.
For Stripe, however, the deal would give its own brand a customer-oriented profile and access to more than 400 million users.
Advent, in turn, has a long history of acquiring payment services companies and has recently become a partner in Worldpay.
According to knowledgeable sources, Stripe and Advent intend to become partners in PayPal.
PayPal has declined to comment on the bid.
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