How to edit gold for video?

[Knorrex]

Modified client & pserver maybe?
But i guess OP wants to use a real game server, with people.

When you buy equipement in nexus (not keys, essence, dyes ... i mean armor, weapons....) are they stored in your inventory or in gift chests?

Your inventory, after buy confirmation from the server

[aliampolizzi]

Or more simply, instead of trying to modify the game, if all you want to do is make it look like you have gold and are buying things in a video, just edit the video instead.