PayGateway: epay-compatible Go payment gateway with plugin channels and verifiable ledger

current_callback.example.txt

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+# Copy this file to current_callback.txt for local development only.
+# Do not commit production callback URLs.
+alipay: https://example.com/alipay/notify
+wechat: https://example.com/wechat/notify
+tunnel: https://example.com