Google's Android Pay is hooking up with banks around the world.

The mobile payments service announced Wednesday that it's partnered with Bank of America, Bank of New Zealand, Discover, mBank and USAA.

Now customers of these banks can add their cards to Android Pay.

"This latest collaboration with banks expands Android Pay's capabilities as an open platform, and moves us closer toward our goal of empowering mobile payments everywhere," Pali Bhat, Google's global head of payment products, wrote in a blog post.

Mobile payments, which have been discussed for years, have been slow to take off.

But many more customers are expected to start using their phones to buy items in stores now that three of the biggest tech companies in the world -- Apple, Google and Samsung -- have introduced new mobile-payments platforms.

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