How can I find out the payment method used based on a stripe invoice object?

I am trying to create a custom pdf invoice based of a stripe invoice object using php. One of the fields that I need to show is the payment method and basic details about the payment method(such as the last 4 digits if it was a credit card, last 4 numbers of the bank account if it was a bank transfer, etc...).

How can I find the payment method used by the customer for the invoice in question?

To start off I have the stripe invoice ID which allows me to retrieve the invoice object using the stripe api... How can I get to know if the customer, for this particular invoice used a credit card, bank transfer, etc, and then some more spec details about details about the payment method?

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