The logo must be super simple visually and work in a very small space. Therefor, it cannot be typography centric, i.e. the symbol must work alone without the name "Zlick".
Our embeddable payment button will be featured on many sites across the web.
These sites can have many different designs and colour schemes. It is expected the icon should have different coloured versions for light and dark backgrounds in addition to the blue for our own branding.
We don't expect this work to actually include these variations (although it may), but rather the design should be simple enough to also work at such small scales.
Since this is a financial service, the shape and colour scheme absolutely must convey trust and be appropriate in even the strictest of contexts such as banking, air travel etc.
Here you can find a quick mockup of our service will work: http://adobe.ly/1Pmzhuc
It's Estonian but if you click in the negative space you'll see possible interactions areas.
What is displayed here is the first time flow. The zero click comes in when after the first authentication you go to the menu section and then click on an individual article with a price listed. Then the charge is applied automatically when opening the article. This is simply to explain the concept visually based one use case.