Fixing error on my stripe

I need my ebook checkout error to be fixed. As am having this error parameter_invalid_integer - line_items[0][price_data][unit_amount]

I need the .(dot) on the amount to be removed and then make EUR as the default checkout even though user will have to select their currency but on the final stage Eur should be the deafult currency

Note: This is just a minor fix over priced developer will be ignored