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[WH40k] Is there a process for Rogue Traders visiting Imperial worlds? What kind of reception will they receive?

Say a Rogue Trader has gone out beyond the fringes of The Imperium, come back alive, and now finds the need to restock their ship with supplies before going back out again. Supplies that can only be found on Imperial worlds. 

The Rogue Trader is from one of the old dynasties, with their Warrant of Trade signed by The Emperor himself. They're also extremely well armed, walking around in power armour when not on their ship.

Given the power of Rogue Traders, what kind of reception would they receive on an Imperial world? Are there any special precautions they have to take for fear of getting in trouble with the wrong people?
gpt
A Rogue Trader, in general terms, is a big deal. Half bold adventurer, half robber baron, they own and operate a ship in a universe where a good ship is a very rare commodity. The Warrant to be a Trader isn't too far off from a noble title in many ways. 

On an Imperial world, a Trader and their personal retinue can expect to rub shoulders with the elite, up to and including the Governor of the planet, without much hassle. Every political player on the planet is a potential trade partner or enemy (or both, simultaneously or alternately), since a Trader can be a connection to resources that are rare, illegal, or both. If they choose to slum it, they've got enough firepower to head to the wrong side of the tracks with good odds of making it back across, and enough cash to shift the balance of power in the shadows with a few big buys.  

As far as precautions, the big ones to be wary of are A) rich people looking to screw them on a deal or B) poor people hoping to shank them and rifle through their pockets. The former is a constant threat when moving among the Beautiful People, who would no doubt spend literally *years* bragging on how they got a Trader to sign a lopsided contract, or lowballed the shit out of them on a priceless artifact. The latter is pretty much a constant threat, since to a Trader "poor people" can be nearly anyone.