How do I make a panel appear after a button is clicked?

So in my game I have a fake microtransaction store and want to display a confirmation panel when the player goes to buy an item but I'm not sure how to do it, this is my current script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class IAP : MonoBehaviour
 {
     public Text currencyText;
 
     public int currencyToAdd;
 
     public bool isPressed;
 
     public bool clicked;
 
     public Button _50currency;
 
     public Button _100currency;
 
     public Button _3000currency;
 
     public GameObject _50CurrencyConfirm;
 
     public GameObject _100CurrencyConfirm;
 
     public GameObject _3000CurrencyConfirm;
 
     [SerializeField]
     int currencyRequirement;
 
 
     private void Start()
     {
         currencyText.text = "Currency: " + GameManager.Instance.currency.ToString();
         currencyToAdd = 0;
         isPressed = false;
         clicked = false;
         _50CurrencyConfirm.SetActive(false);
         _100CurrencyConfirm.SetActive(false);
         _3000CurrencyConfirm.SetActive(false);
     }
 
     public void _50Currency()
     {
         currencyToAdd = 50;
         GameManager.Instance.currency += currencyToAdd;
         currencyText.text = "Currency: " + GameManager.Instance.currency;
         isPressed = true;
     }
 
     public void _100Currency()
     {
         currencyToAdd = 100;
         GameManager.Instance.currency += currencyToAdd;
         currencyText.text = "Currency: " + GameManager.Instance.currency;
         isPressed = true;
     }
 
     public void _3000Currency()
     {
         currencyToAdd = 3000;
         GameManager.Instance.currency += currencyToAdd;
         currencyText.text = "Currency: " + GameManager.Instance.currency;
         isPressed = true;
     }
 
     public void Confirmation50()
     {
         Button button = _50currency.GetComponent<Button>();
         button.onClick.AddListener(CurrencyOnClick50);
         clicked = true;
     }
 
     public void Confimation100()
     {
         if (clicked == true)
         {
             _100CurrencyConfirm.SetActive(true);
         }
     }
 
     public void Confirmation3000()
     {
         if (clicked == true)
         {
             _3000CurrencyConfirm.SetActive(true);
         }
     }
 
     public void CurrencyOnClick50()
     {
         if (clicked == true)
         {
             _50CurrencyConfirm.SetActive(true);
         }
     }
 
     public void Deactivate()
     {
         _50CurrencyConfirm.SetActive(false);
         _100CurrencyConfirm.SetActive(false);
         _3000CurrencyConfirm.SetActive(false);
     }
 }