On Thursday, PayPal said that it expects more than five million merchants will be allowing shoppers to use One Touch, and 36 million consumers will using One Touch by the end of the year. That’s up from 22 million consumers from this past spring.

One of the key challenges to mobile and web payments is being able to carry payment information—including credit cards—across mobile platforms and websites as well as shipping and billing information. Apple (AAPL) and Google (GOOG) are trying to do this on mobile phones with their respective mobile payments services, Apple Pay and Android Pay. Apple just expanded its payments service to web-based mobile payments as well.

In 2015, PayPal (PYPL) introduced its attempt at a universal wallet called One Touch payments. With One Touch, you need only log in once with PayPal to pay for goods across different mobile apps and websites.

While PayPal is touting the growth of its number, it will likely face increased competition from Apple as its payment service expands.

Of course, while Apple and PayPal compete on consumer’s choice of the mobile wallet, the two companies are also partners. PayPal said users of its Venmo app, which allows people to snd money to one another, can use iMessage and voice assistant Siri to send and receive money. PayPal’s payment processing arm, Braintree, which powers payments for merchants like Airbnb, will also now allow its merchants to add Apple Pay as a payment option for web payments.

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The holiday shopping season is nearing, and PayPal is gearing up for another record season in terms of payments volume. During peak times on Cyber Monday—the online shopping bonanza that takes place the Monday after Black Friday—PayPal expects to see more than $25,000 in total payment volume per second.