HONG KONG (Reuters) - Alibaba Group Holdings' finance arm on Wednesday demonstrated a payment service that will allow virtual reality shoppers to pay for things in future just by nodding their heads.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=JTAjf2rtbnY:Njjyb8-PETo:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=JTAjf2rtbnY:Njjyb8-PETo:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=JTAjf2rtbnY:Njjyb8-PETo:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=JTAjf2rtbnY:Njjyb8-PETo:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=JTAjf2rtbnY:Njjyb8-PETo:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/JTAjf2rtbnY" height="1" width="1" alt="" />