Currently, there are two placeholder plugins supported; PlaceholderAPI and MVdWPlaceholderAPI. Both plugins can work together but the plugin will favor MVdWPlaceholderAPI over PlaceholderAPI in messages.
For each Rank:
<Rank Placeholder>_price - The rank's price
<Rank Placeholder>_prefix - The rank's prefix
For each Prestige:
<Prestige Placeholder>_price - The prestige's price
<Prestige Placeholder>_prefix - The prestige's prefix
pr_rank_prefix - The player's rank's prefix
pr_rank_price - The price of the player's rank
pr_prestige_prefix - The player's prestige's prefix
pr_prestige_price - The price of the player's prestige
pr_nextrank_price - The price of the player's next rank
pr_nextprestige_price - The price of the player's next prestige
For all placeholders that are for each rank and prestige (e.g. <Rank Placeholder>_price) the prefix is pr_. An example is pr_A_price. For global place holders, the prefix is already listed, pr_.
All placeholders are same as listed above.