Starbucks will roll out its Mobile Order and Pay service nationwide this year, the company announced yesterday.

Starbucks started the program last month, but has greenlighted its rollout into more than 600 stores in the Pacific Northwest “in the months ahead.” Its full nationwide rollout will take place before yearend.

Starbucks said Mobile Order and Pay is driving mobile payments at the coffee company.

Our experience to-date confirms that once fully rolled out, Mobile Order and Pay will drive a significant increase in mobile payment transaction in our stores overall and have a flywheel positive effect on our overall business, driving both increase [My Starbucks Rewards] membership and app usage and creating significant additional one-to-one marketing opportunities.

To what degree is mobile driving growth at Starbucks. The company yesterday confirmed its fiscal 2015 non-GAAP EPS growth target of 16% to 18%, and company officials said Mobile Order and Pay will be a major driver of that growth.

As of last month, 12 million consumers were “actively using” the Starbucks app, which was fielding 7 million transactions per week, or 15% of Starbucks’s sales, according to company figures.

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