what is the Google Affiliate Network ???

Google Affiliate Network is a segment of the Google Display Network comprised of affiliate publishers who specialize in driving conversions for advertisers.

Google Affiliate Network Data Feed Management

Google Affiliate Network provides the platform, network and service you’ll need to grow your online sales through performance-based affiliate marketing. By partnering with Google, you gain access to affiliate publishers, a segment of the Google Display Network, who specialize in reaching consumers with a high propensity to convert.
VersaFeed can assist qualified Google Affiliate Advertisers feed their data to Google Affiliate Publishers with "link subscriptions" via optimized data feeds in Google Merchant Center. Link subscriptions ensure publishers have the most current and best-performing links. Google Affiliate Network advertising is a CPA (cost-per-action) program and requires acceptance into the Google Affiliate Network advertising program.

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• Billing Basics                                                                                                                                                                    Source  : http://www.versafeed.com/overview/advertising-platforms/gaffiliate/