post https://{region}/api/v3/public/shipping/generate-multiple/
This endpoint allows users to generate additional shipping labels for an existing offer. It is typically used when the customer needs to include multiple packages for the same order or shipment. The number of additional shipping labels that can be generated is determined by the account’s Offer Settings configuration. Once the configured limit is reached, no further labels can be created. The response from this endpoint returns the generated shipping label directly as a PDF file.