Downloading received invoices

[pollotod]

Hello, I am looking for a way to download the purchase invoices received by using your library, however I cannot find the correct functions. Would you be so kind as to help me with this please?
The objective is to have all the purchase information digitized and organized. RUT's of the suppliers, transfers and of course the glosses of the received invoices, among other things.

Thank you very much for your time.