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Google api key in Magento 1.9.4.5

I need to know where to put my Google Map API Key in Magento 1.9.4.5 to prevent wrong inputs in address bar. I think it is straight forward in Mgento 2 but I can not find anywhere in Magento 1.9.4.5! Now the address input bar accept wrong addresses and I need to integrate the Google API to prevent this matter. Thank you for your help.