sabpaisa 1.1.0

Official Flutter/Dart SDK for SabPaisa Payment Gateway 2.0 — payments, refunds, transaction enquiry, webhook verification.

1.1.0

• Added SabPaisaCheckout widget for in-app WebView checkout with UPI intent handling
• Added CheckoutResult sealed class hierarchy (CheckoutCompleted, CheckoutError, CheckoutCancelled)
• Handles UPI app launches (upi://, intent://, gpay://, phonepe://, etc.)
• Intercepts both GET redirects and POST form submissions to the return URL
• Includes double-fire guard, back-button handling, and web resource error reporting

1.0.1

• Added udfFields support in CreatePaymentRequest for user-defined fields (udf1–udf20)

1.0.0

• Initial release
• Payment session creation with checksum
• Return URL verification
• Transaction enquiry
• Refund creation, status, and listing
• Webhook signature verification with replay protection
• Full error hierarchy (SabPaisaError, ApiError, ChecksumError, ValidationError)
• Retry with exponential backoff for safe/idempotent requests
• Request timeout (30s default)
• Timing-safe HMAC comparison