Plastiq, a Boston-based payments startup and a 50 on Fire finalist in Tech, has raised $6 million in Series A funding, according to a release from the company. Plastiq allows users to pay various recurring payments – tuition, rent, etc. – using your credit card, thereby maximizing credit card rewards.

The new funding was led by Atlas Venture and Flybridge and includes NextView Ventures, Greenoaks Capital, and former American Express CEO Harvey Golub.

“I first met Dan Choi and Eliot Buchanan at Harvard’s i-lab when they were undergraduates and watched them develop their concept to reality,” said Jeff Bussgang, general partner at Flybridge Capital Partners. “The early traction the company has achieved is amazing. With its innovative vision, state-of-the-art product, and strategic partnerships, Plastiq is well positioned to transform the payments industry.”

Bussgang will join Plastiq’s board, as will Atlas’s Ryan Moore.

“The team of people Eliot has assembled is unparalleled in their expertise and equally motivated to build a truly game-changing payments platform,” commented Moore in the release.

Plastiq had previously raised $2.35 million, bringing its total raised to $8.35 million.