POST /admin/application_credits.json HTTP/1.1 Host: merchantshop.myshopify.com Content-Type: application/json X-Shopify-Access-Token: 35ee86casd97e9b8b10089afa4ccb654 { "application_credit": { "description": "Sorry you paid twice by mistake! Here is a $5 credit.", "amount": 5.0 } }