Hello Roberto, You have a wealth of solutions at your disposal, and you are not obliged to use any of these, but choose the one that fits your purpose best. You may choose something similar to "Physical transactions with a custom payment gateway", detailed on the "Transactions" page <https://developers.google.com/actions/transactions/>. You may implement other solutions through actions, as detailed on the "Actions on Google" page <https://developers.google.com/actions/>, with more related information linked on that page.
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