d払い－スマホ決済アプリ、キャッシュレスでお支払い

1. Download and sign in: Install the app, sign in or create an account, and complete basic verification if prompted. 2. Add a payment method: Link a credit or debit card, bank account, or supported carrier billing to fund your payments. 3. Pay in store: Open the app, tap Pay, show your barcode or scan the merchant’s QR code, then confirm the amount. 4. Pay online: Select d Payment at checkout on supported sites and confirm the payment in the app. 5. Save and manage: Activate coupons, track rewards, view transaction history, set alerts, and enable PIN or biometric lock for security.