eSewa or Khalti payment returning errors at checkout
Third-party Shopify payment apps for Nepali gateways are published by developers who do not always maintain them through eSewa or Khalti API updates. When the gateway provider updates their authentication flow or endpoint structure, the app breaks. Buyers who tap "Pay with eSewa" and hit a redirect error abandon the cart. The store owner files a support ticket with the app developer and waits. A custom-built Shopify Payment Provider extension built directly against the official eSewa Payment API or Khalti Payment API does not have this dependency. The integration is maintained by the team that built it. When the gateway updates, the extension is updated.