Europe B2B eCommerce Market Size, Share & Trends Analysis Report By Category of Supply (Office Supplies, FMCG, IT Products, Industrial, Manufacturing, Maintenance, Repair, Janitorial and Sanitation), By Deployment (Supplier-Oriented, Buyer-Oriented, Intermediary-Oriented), By Channel (Direct Sales, Marketplace Sales), By End-User (Automotive, Construction, Manufacturing, Information Technology, Telecom and Media, Transportation and Logistics, Retail and Distribution, Others) and By Country (U.K., Germany, France, Italy, Russia, Nordic, Benelux, Rest of Europe) Forecasts, 2026-2034