There are a few requirements to be eligible to use the Google AdWords Cost Per Acquisition model. First, you need to have the AdWords conversion tracking pixel installed on your site and you’ll need 15 conversions tracked through the conversion tracking over the previous 30 days. If you are serious about marketing your site and products, this should be very easy for you to accomplish.

Once you fulfil all the requirements, you can edit your campaign by changing the settings under Bidding and budget > Bidding option from Manual bidding for clicks to Automatic bidding to try to maximize clicks for your target budget.

You will be asked to set a value to the conversions, in other words, how much you’re will to pay per sale. When you enable the Conversion Optimizer for a campaign, you set a maximum CPA bid for each ad group.

Ready, set, go. You’re pretty much done, make sure to check back on it.