💡2. Initialize IMP object
Prepare for payment integration using the Merchant ID.
On the checkout page, initialize the IMP object using your Merchant ID.
  var IMP = window.IMP;   // Can be omitted
  IMP.init("Merchant ID"); // Example: imp00000000   const IMP = window.IMP; // Can be omitted
  IMP.init("{Merchant ID}"); // Example: imp00000000aBe sure to initialize the IMP object only once.
Calling a sub-merchant (Tier) payment window
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