The phrase "purchase action" is correct and usable in written English.
You could use it when you are referring to the process or action of buying something. For example: "The company is taking purchase action to acquire a new factory."
The site describes itself as "We allow advertisers to purchase actions on social networks" and says that they are "50 to 100 times more cost effective than conventional Internet advertising".
On the other hand, mAb producers in China directly purchased the production technology from foreign countries, as demonstrated by the technology purchase actions of Shanghai Mei'en (collaborate with University of Southern California, USA) and Shanghai Celgen (transfer from Condar Co., Ltd., USA).
Apple could also be looking at ways of making mobile barcodes more engaging, recently winning a patent that links the scanning directly with a "shopping list" purchasing action.
As a result, app developers for Windows 8 (including Windows Store apps running on Windows RT and Microsoft Surface tablets) can now get in on Fortumo's in-app purchasing action, with support for carrier billing in around 80 countries and 250 mobile operators — a feature that is particularly relevant in emerging markets where credit card take-up is significantly lower.
There is a significant amount of psychological research out there that notes a disconnect between one's thoughts and their purchasing actions.
Likewise, the concept of sustainability can apply to many aspects of the food chain--from farming, transportation, processing, and retailing to post-purchase actions including storage, preparation, consumption, and disposal.
You can purchase an Action Replay that works with your physical Nintendo DS system, or you can use an emulator with built-in Action Replay support like DeSmuME.
The essence of the regulations is "thou shalt not mislead the consumer as to the effect his or her purchase or action will have on any donation," said Edward B. Chansky, a lawyer with Greenberg Traurig in Las Vegas.
Historically, it's best to wait until closer to Christmas to purchase dolls, action figures and the like.
