This python script works as a robot which takes 'product asins' stored in a text file in the same directory with the name 'asins.txt' and enters and select the specified product for coupon activation on Amazon SellerCenter.

amzn-coupon.py

import pyautogui
import time

with open("asin.txt", "r") as asins:

    time.sleep(3)
    
    for line in asins.readlines():
     
        pyautogui.typewrite(line)
     
        # pyautogui.press("enter")

        time.sleep(3)

        for i in range(4):
            pyautogui.press("tab")

        pyautogui.press("enter")

        with pyautogui.hold('shift'):  # Press the Shift key down and hold it.
            for i in range(4):
                pyautogui.press("tab")

        # time.sleep(8)