As announced in February, flexible conversion counting in AdWords now lets you decide how you want to count conversions for each of your accounts. As a follow up to this new feature, when new AdWords accounts are created through the UI or the API after October 1st, 2014, the default conversionOptimizerMode will be MANY_PER_CLICK instead of ONE_PER_CLICK. In addition, we'll change the conversionOptimizerMode to MANY_PER_CLICK on any existing account that is not using bidding strategies impacted by conversions.

Action required
Since the new default of MANY_PER_CLICK lets your conversion-based bidding strategies take full advantage of flexible conversion counting, we recommend keeping the default setting on new accounts. However, if you still want to use ONE_PER_CLICK for new accounts created via ManagedCustomerService, then add a second step in your account creation process that issues a CustomerService.mutate call that sets the conversionOptimizerMode on the Customer.

In addition, if you decide to utilize one of the conversion-based bidding strategies, you'll want to make sure that the conversionOptimizerMode is set to the value you'd prefer. The conversion-based bidding strategies affected by conversionOptimizerMode are:

• CONVERSION_OPTIMIZER
• ENHANCED_CPC
• PERCENT_CPA
• TARGET_CPA
• MANUAL_CPC (when ManualCpcBiddingScheme.enhancedCpcEnabled is true)
• BUDGET_OPTIMIZER (when BudgetOptimizerBiddingScheme.enhancedCpcEnabled is true)

Additional information
If you'd like to learn more about conversion tracking in AdWords, check out the Help Center article on counting conversions. In addition, the remarketing examples folder in each client library contains an AddConversionTracker example that shows how to create an AdWordsConversionTracker via the API.

Still have questions? Feel free to visit us on the AdWords API Forum or our Google+ page.

- Josh Radcliff, AdWords API Team

Source: Google Ads Developer Blog