CRITICAL: Paypal different order amount error.

Hello.
Today we've had a very different problem.
Customer bought 5x same product.
total amount 214,44€



However, paid with paypal only: 0,06€



Our opencart version 1.5.4
This is a major problem for me.
Because I sell digital products. Instant is sending.
By trading in this way if the customer receives the product I'd hurt.
I'd be happy if you help me
I'm sorry for my bad english.

Thanks.

soneria, your English is just fine. It seems that you need to go through all of your pricing, tax, shipping, and other Euro values, and perhaps probably to set up Geo Zones for those, with a fine tooth comb. Something is missing, either Euros or Geo Zones, maybe both would be good places to start. Meanwhile, you can institute a delay so that you authorize downloads manually. They know they're supposed to pay Euros not 6c, and odds are that most of them will happily knowingly pocket the difference. You know the difference, you rather than the customers are supposed to be paying, and you know why to approve the downloads manually.

the paypal standard callback function should have captured that. Look into system > settings > options > default order status. Ensure it's not your complete status.

Those jokers are just tampering with your order data to paypal. Those are caught pretty much easily.