There are three URLs listed on the endpoint of the specification. Which one should I use? August 14, 2024 05:53 Test environment: Sandbox server Production environment: Production server Please do not use the Staging server. Related articles Can I use the PayPay app in a test environment? What are the application items required to connect to the production environment? Where can I find MERCHANT_ID, API_KEY, and API_SECRET in "PayPay for Developers" to use in building the SDK? Is it possible to set query parameters in the redirect URL? When is an account link required?