I am sure that some others with more agenting knowledge than I have will chime in, but here is my $0.02.
When party A finds an advertisement for an item outside of their geographical area, party A would request that someone willing to act as an "agent" in that area.
If party B agrees to be that agent, then A informs B of the item and how much money he is willing to offer.
B makes contact with the seller, purchases the item, and then aranges shipping the item to party A.
Parties A and B will need to have a plan for the the exchange of money between them. This is usually handled through PayPal, but Venmo and Square Cash work also.
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