PayPal is showing that it’s serious about supporting developers. Today, the company announced that it has acquired mobile platform StackMob in a move that will bolster its efforts to accelerate adoption of its payment system within apps. Terms of the deal haven’t been disclosed, but we do know that the deal has closed.

PayPal has confirmed that it has purchased San Francisco-based app developer StackMob. PayPal’s spokeswoman wouldn’t comment on terms of the deal but did say that 18 of StackMob’s engineers will be relocating to PayPal’s headquarters in San Jose.