I have chance to work with Google Geocoding API lately...in Salesforce of course. The requirement is to retrieve address from Google Geocoding by passing postal code.When passing postal code through HttpRequest, it should return the response in JSON.But I am not going to write how I call it in this entry.I will save it for future.*cough* So I will write on how to generate signature... Note on this limitation between free API and paid one. Users of the free API: 2,500 requests per 24 hour period. 10 requests per second. Maps for Business customers: 100,000 requests per 24 hour period. 10 requests per second. To create API you can go here .Use our own Google account.But I found out without API key also it works. See!!This is free...you can play around with it. https://maps.googleapis.com/maps/api/geocode/json?components=postal_code:97510 So I go for Maps for Business customers, what is that mean? It means , we required to have client and signature. Google will