Follow these steps to purchase rare plans in Fallout 76:

1. Write to the seller and check if he is online.
2. Pay for the purchase and receive a unique 16-digit code.
3. Tell us this code and your nickname in the chat.
4. Specify which of plans you want to purchase.

The seller will send a request to friends in the game. As soon as you accept the invitation, the seller will move into your world and meet with your character.
The order is executed immediately if the seller replied to you in the chat or within a maximum of 24 hours.