Klarna Docs - Pay Now Standalone integration guide

**Pay Now Standalone Integration Guide**The guide covers the integration process for Pay Now Standalone with Klarna. Key steps include:1. **Get Authorization**: Provide customer details to assess and authorize the purchase.2. **Create an Order**: Use the authorization token to create an order and complete the one-time payment.3. **Post-purchase Activities**: Manage orders, captures, and refunds using the Order Management system.**Payment Status Notifications*** Receive notifications via webhooks for payment status updates.* Payload includes data such as order ID, payment status, and transaction ID.* Note: Create an order within 5 minutes of receiving authorization token to receive UNPAID-webhook notifications.**Settlement Reports*** Receive detailed breakdowns of payments made by Klarna.* Reports available in CSV, PDF, or JSON format through Merchant Portal, Settlement API, or SFTP.**Webhooks*** Configure webhooks using the Webhook Notifications page in Merchant Portal Settings (coming soon).* Set up a publicly accessible HTTPS endpoint with a valid SSL certificate to receive webhook notifications from Klarna.* Verify the authenticity of notifications by generating and setting your own signing key.**Non-breaking Changes*** Generate a signing key to verify the authenticity of notifications sent by Klarna.* Validate signatures by comparing values of the Payload-Signature header with the message body and signing key.Let me know if you have any further questions or if there's anything else I can help you with!