Phoenix-based online automobile retailer Carvana is getting financing for up to $600 million of retail contracts from Ally, according to a Wednesday announcement.

Over the next 12 months, Ally will make up to $600 million available to Carvana through financing and bulk purchases of contracts.

Carvana was founded in 2013, and sells and lets customers be able to complete their purchase of a car in less than 15 minutes.

Carvana’s agreement with Ally plans to help support the firm’s growing origination volume, and let the company maintain a seamless and transparent financing experience for customers.

The agreement expands Ally’s existing relationship with Carvana, which also includes a floorplan credit line and vehicle sourcing through Ally’s SmartAuction platform.

“The agreement with Ally will provide Carvana reliable and consistent financing to support both our origination growth and future expansion plans,” said Ernie Garcia, Carvana founder and CEO. “As we look to enter new cities, this relationship will help us to easily accommodate more volume, while maintaining the seamless customer experience that we are known for.”

Carvana operates in 21 markets, but not in Phoenix where it’s based. The firm does plan to expand into additional states over the next few years.

This year, Carvana closed on a $160 million Series C funding round in August, totaling the firm’s funding to $460 million. Carvana also opened up a coin-operated car vending machine.