Expanded DeutschePostOrder and DeutschePostBulkOrder models to support full Deutsche Post API integration, including authentication, order creation, finalization, tracking, cancellation, and label/document generation. Added new fields for label PDFs and bulk paperwork, improved country mapping, and implemented comprehensive validation and utility methods. Updated serializers to expose new fields and computed properties. Added HTML templates for individual and bulk shipping labels.
Brunobrno
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