Hi, It's a rather imprecise 'it'. You could take it to mean the card-machine in the store, or the card-company's computer system. In practice, we have no real trouble in understanding such sentences.
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CliveYou might like to consider 'It's going to rain'. What do you think 'it' refers to, here?Thanks to you and other members, I think I understand this point, which I've done here before. it refers to the wea
Cliveit sounds odd to say 'The weather is going to rain'.Oh yes, it does.
CliveNot exactly. It's a generalized and rather vague 'it'.I understand.