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I have a look to what you searched for. RE automatic gear: be sure to choose "automatic" from the left hand side TRANSMISSION filter on the search results page.

You can filter out automatic so you only see those.

I see it is for today so I adjusted the pick up time to be at least one hour from now and now the website show results (vehicles).

Yes. You can pay online with any card. Be sure you have a credit card to hold the security deposit on arrival when you pick up the car. Some suppliers accept a Debit Card for the deposit. You can check by clicking the link IMPORTANT INFORMATION (at the right of each car photo), then choose PAYMENT.