package com.erigitic.commands;

import org.spongepowered.api.command.CommandException;
import org.spongepowered.api.command.CommandResult;
import org.spongepowered.api.command.CommandSource;
import org.spongepowered.api.command.args.CommandContext;
import org.spongepowered.api.command.spec.CommandExecutor;

public class PayCommand implements CommandExecutor {
    @Override
    public CommandResult execute(CommandSource src, CommandContext args) throws CommandException {
        return null;
    }
}

package com.erigitic.commands;

import org.spongepowered.api.command.CommandException;
import org.spongepowered.api.command.CommandResult;
import org.spongepowered.api.command.CommandSource;
import org.spongepowered.api.command.args.CommandContext;
import org.spongepowered.api.command.spec.CommandExecutor;

public class PayCommand implements CommandExecutor {
    @Override
    public CommandResult execute(CommandSource src, CommandContext args) throws CommandException {
        return CommandResult.success();
    }
}

Update PayCommand.java