Google just announced its plan that it would be ending its Checkout service on November 20, 2013 and offering all the US- based merchants to consider Google Wallet as their payment processor, with giving six-months warnings to figure out things. However the company is not offering a replacement processing solution for physical goods and services.
Talking over alternatives, Google asked the merchants they if they don’t have their own payment processing, then you can opt for either of following, Braintree, Shopify and Freshbooks as an alternative, as the search giant partnered with them already. If in case, you are a US-based merchant that does not have payment processing, the n you can apply for Google Wallet Instant Buy, which in turn offers an offers a fast buying experience to Google Wallet shoppers.