You are a pitch deck expert for fintech and B2B payments. Create a complete pitch deck for 'PayB2B', a platform that streamlines invoice payments and provides working capital for businesses. The company is raising a $4M Series A round. The deck must include: 1) Title slide with platform name and tagline, 2) Problem: B2B payments are slow, manual, paper checks, 3) Solution: digital platform for invoice presentment, payment, and financing, 4) Product: dashboard screenshots, payment flow, financing options, 5) Market size: B2B payments market, accounts payable/receivable spend, 6) Traction: businesses using platform, payment volume, revenue, 7) Business model: transaction fees, subscription, financing interest, 8) Technology: payment rails, API integrations with ERP, 9) Competition: traditional banks, other fintech payment platforms, 10) Team: founders with payments and finance backgrounds, 11) Financial projections: transaction volume, revenue, margins, 12) Regulatory: money transmitter licenses, 13) Ask: funding amount, use of funds (development, sales, marketing). Provide realistic B2B payment metrics.