A senior Mizuho analyst maintained his rating on PayPal stock at outperform after the company announced that Dutch payments company Adyen would offer Fastlane, a popular checkout tool that PayPal provides to its enterprise and marketplace customers in the U.S.

Fastlane’s product must be strong, as evidenced by the willingness of Adyen – a direct competitor to PayPal-owned Braintree – to agree to the partnership, wrote Dan Dolev, senior analyst of fintech equity research at Mizuho Securities USA, in an Aug. 20 research note. Dolev had previously said Fastlane’s total addressable market could be $3 trillion, of which $1.43 trillion is realistically addressable, according to a May 30 note.

News of the partnership sent PayPal shares to their highest closing price of $71.89 on Tuesday. On Wednesday, the stock closed at $71.46, down 43 cents.

In April, Stripe announced a change in strategy, saying it would unbundle its payments services from its other financial offerings. Removing payments from Stripe’s broader range of financial products would make their products more accessible to merchants, FinTech Magazine said. Dolev said Assets that he believes PayPal will unbundle as well. “Everyone loves Stripe. Why wouldn’t they love PayPal? They do exactly the same thing,” he said.

Such a move should lead to wider adoption of Fastlane, Dolev said in the Aug. 20 note. “We see the potential for a $1 billion to $1.5 billion increase in transaction margin (5-10 percent upside),” Dolev wrote. He also reiterated his outperform rating on PayPal and a $90 price target.

In January, PayPal introduced Fastlane, a guest checkout feature designed to help merchants make online shopping faster and easier. Many consumers choose not to store their credit card information with merchants and typically use guest checkout to shop. This can lead to lost sales, as guest checkout can be slow and cumbersome. Instead of storing their credit card information and shipping address with a merchant, consumers store it once with Fastlane. The next time they shop, Fastlane automatically pre-fills their information, saving the consumer time. PayPal officially launched Fastlane in early August.

PayPal and Adyen have been working together for several years. Adyen customers have access to PayPal, Venmo, and PayPal’s buy-now-pay-later (BNPL) solutions. The two companies expanded their collaboration on August 20. Adyen can now offer Fastlane to speed up guest checkout for its enterprise and marketplace customers in the US.

“Investors should start looking at PYPL as a platform for all types of payments and not just a short-sighted, limited view of branded checkouts,” Dolev said.

This story originally appeared on Fortune.com