title: Apply Stripe Coupon only for selected payments of subscription
body: <p>I need to apply stripe coupon for 3 months plan and 1 month plan.For the person subscribe to 3 moths plan will recieve 100% discount for the first payment and the person who subscribe for 1 month plan will recievie 100% discount for 3 concecative payments(for 3 months).</p>
  
  <p>How this can be achieved within the stripe.We can use percentage or amount as the discount.</p>
  
  <p>In addition to that, if the person upgrate the plan within the copoun applied period, is there a special way to distribute coupon amount using stripe</p>