First of all, which one is the key that I have to provide to the 'Bing Search API – Web Results Only' service? Is it the one in 'https://datamarket.azure.com/account/keys' which says 'Default'? (there is no other)
And when I finally do get the correct key, since there is no place in the query string for it, how can I embed the key somewhere in my PHP code so users from my webpage can use bing to search without being asked for a key?
PS (Feedback time): I'm doing a research on search engines and Bing is the hardest for developers to use so far, mainly because of outdated/incomplete helping documents scattered all over MS websites.