Per provider, this API will be deprecated in January 2019. Developers are encouraged to migrate to the Google Photos Library API
From their site: The Picasa Web Albums data API allows client applications to view and update Picasa Web Albums content in the form of Google data API GData feeds. Your client application can request a list of user albums, photos, comments, or tags, edit or delete content in an existing entry, and query the content in an existing entry.
The following is a list of sample source code snippets that matched your search term. Source code snippets are chunks of source code that were found out on the Web that you can cut and paste into your own source code. Whereas most of the sample source code we've curated for our directory is for consuming APIs, we occasionally find something interesting on the API provider side of things. If you know of some sample source code that would be of interest to the ProgrammableWeb community, we'd like to know about it. Be sure to check our guidelines for making contributions to ProgrammableWeb.
Picasa, the Google service that provides photo sharing on Google+, offers code samples in Java, .NET, PHP, and Objective-C. Examples can be found in the Picasa Web Albums Data API site. To supplement, tutorials show how to work with Eclipse using the Java library, work the Google Data APIs on Salesforce, and use Proxy servers with Google data client libraries.