Claim reward only once

[Le4ft]

Hi,
I'm using Skript and Skript-GUI to create a battle pass thing and I'm facing this problem:

How can I make that the reward can be claimed only once?

I'm pasting here part of my code, can anyone please help me?

        create a gui with virtual chest inventory with 5 rows named "&6&lBattle Pass" and shape "xxxxxxxxx", "x-------x", "x-123---x", "x-------x", and "xobxpxhxx":
            make gui slot "1" with sunflower named "&6Coins Reward" with lore {@bp1_lore}:
                if {bpxp::%player%} is lower than 10000:
                    set {_needed} to difference between {bpxp::%player%} and 10000

                    cancel event
                    close player's inventory
                    send "&6&lBATTLE PASS! &7You need &b%{_needed}% XP &7to claim this reward!"
                else:
                    send "&6&lBATTLE PASS! &7You received &620,000 Coins&7!"
                    add 20000 to {coins::%player%}

                    set {@bp1_lore} to string "&aClaimed"

                    close player's inventory

                    close player's inventory

 

[ProxiCent]

create a gui with virtual chest inventory with 5 rows named "&6&lBattle Pass" and shape "xxxxxxxxx", "x-------x", "x-123---x", "x-------x", and "xobxpxhxx":
            make gui slot "1" with sunflower named "&6Coins Reward" with lore {@bp1_lore}:
                if {bpxp::%player%} is lower than 10000:
                    set {_needed} to difference between {bpxp::%player%} and 10000

                    cancel event
                    close player's inventory
                    send "&6&lBATTLE PASS! &7You need &b%{_needed}% XP &7to claim this reward!"
                else:
                    if {bpr1::%player%} is not set:  # Added
                        send "&6&lBATTLE PASS! &7You received &620,000 Coins&7!"
                        add 20000 to {coins::%player%}
                        set {bpr1::%player%} to now # Added

                        set {@bp1_lore} to string "&aClaimed"

                    close player's inventory

                    close player's inventory