v0.5.0

Added

• Enriched WebhookEventData — webhook payloads now include full transaction chain data:
  • Order: orderStatus, merchantProvidedBuyerIdentity, billingDetail, orderMetadata
  • Amount: taxRate, taxName, subtotal, total
  • Product: productDescription, productMetadata
  • Payment: paymentId, paymentStatus, paymentMethod, paymentLast4, paymentFailureReason, paymentDate
  • Subscription: billingPeriod, currentPeriodStart, currentPeriodEnd, canceledAt
  • Refund: refundStatus, refundReason, refundCreatedAt
• All new fields are optional — existing handlers continue to work