A purchase sign allows a player to right click a sign in-game and then go to the checkout page with that package already in the basket.
From BuycraftX plugins onwards you can set up these signs by adding “[buycraft_buy]” without the quotes on the first line of a sign.
Then leave the rest of the sign blank and select the package from the GUI that pops up.
Once you have chosen the package you would like people to purchase with this sign it will display the package name and price.
Now the package sign is set up you and your players can use them by right clicking on them!