[Brrdy]

Don't quote me if I'm wrong but I think this is correct

Spoiler

#include <sourcemod>
#include <sdkhooks>
 
public Plugin:myinfo = 
{
	name = "FMU BUY MENU",
	author = "AleCs14;o",
	description = "BUY MENU DESIGNED FOR FMU",
	version = "1.0",
	url = "<- URL ->"
}
public OnPluginStart()
{
	RegConsoleCmd("say !shop", MyFunction);
	RegConsoleCmd("say /shop", MyFunction);
	RegConsoleCmd("sm_fmubuymenu", MyFunction);
}
MyFunction(client)
{
	new Handle:menu = CreateMenuEx(GetMenuStyleHandle(MenuStyle_Valve), abcde, MenuAction_Select | MenuAction_End | MenuAction_DisplayItem);
	SetMenuTitle(menu, "| FURIEN MOD ULTIMATE |");

	AddMenuItem(menu, "Ammo", "Ammo Refill - 1,000$");
	AddMenuItem(menu, "Zeus", "Zeus - 1,500$");
	AddMenuItem(menu, "Armor", "Armor - 2,000$");
	AddMenuItem(menu, "Hp", "+25 HP - 3,000$");
	AddMenuItem(menu, "Shotgun", "Shotgun - 3,000$");
	AddMenuItem(menu, "M4", "M4A4 / M4A1 - 3,500$");
	AddMenuItem(menu, "Scout", "Scout - 4,000$");
	AddMenuItem(menu, "Grenades", "Grenades Pack - 5,000$");
	AddMenuItem(menu, "Bhop", "AutoBhop - 6, 000$");
	AddMenuItem(menu, "Wall", "WallHang - 10,000$");

	DisplayMenu(menu, client, MENU_TIME_FOREVER);
}

public abcde(Handle:menu, MenuAction:action, param1, param2)
{
	switch (action)
	{
		case MenuAction_Select:
		{
			//param1 is client, param2 is item

			new String:item[64];
			GetMenuItem(menu, param2, item, sizeof(item));

			if (StrEqual(item, "Ammo"))
			{

			}
			else if (StrEqual(item, "Zeus"))
			{

			}
			else if (StrEqual(item, "Armor"))
			{

			}
			else if (StrEqual(item, "Hp"))
			{

			}
			else if (StrEqual(item, "Shotgun"))
			{

			}
			else if (StrEqual(item, "M4"))
			{

			}
			else if (StrEqual(item, "Scout"))
			{

			}
			else if (StrEqual(item, "Grenades"))
			{

			}
			else if (StrEqual(item, "Bhop"))
			{

			}
			else if (StrEqual(item, "Wall"))
			{

			}
		}

		case MenuAction_End:
		{
			//param1 is MenuEnd reason, if canceled param2 is MenuCancel reason
			CloseHandle(menu);

		}

		case MenuAction_DisplayItem:
		{
			//param1 is client, param2 is item

			new String:item[64];
			GetMenuItem(menu, param2, item, sizeof(item));

			if (StrEqual(item, "Ammo"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Ammo", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Zeus"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Zeus", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Armor"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Armor", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Hp"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Hp", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Shotgun"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Shotgun", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "M4"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "M4", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Scout"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Scout", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Grenades"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Grenades", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Bhop"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Bhop", param1);
				return RedrawMenuItem(translation);
			}
			else if (StrEqual(item, "Wall"))
			{
				new String:translation[128];
				Format(translation, sizeof(translation), "%T", "Wall", param1);
				return RedrawMenuItem(translation);
			}
		}

	}
	return 0;
}

Note: if this doesn't work switch the top where it says

	RegConsoleCmd("say !shop", MyFunction);
	RegConsoleCmd("say /shop", MyFunction);
	RegConsoleCmd("sm_fmubuymenu", MyFunction);

to

RegConsoleCmd("say !shop", abcde);
	RegConsoleCmd("say /shop", abcde);
	RegConsoleCmd("sm_fmubuymenu", abcde);

And I think that should work
Obviously change where it says "say /shop" and "say !shop" if you want to change the IG cmds and "sm_fmubuymenu" is the console cmd