title: How to disable other payment method when using gift card for purchasing a product in shopify?
body: <p>How to make sure that if a customer is purchasing products using gift card then he won't be able to use any other method to pay. he can pay by either any payment method or by using gift card but not both.</p>
  
  <p>example - if a customer have a $500 worth gift card and its cart value is $1000 dollar then he won't be able to pay using gift card.</p>
  
  <p>i have tried using shopify script, but won't able to know if the cart is using gift card or not.</p>