feat(payment): route FlatRender plan purchases through the broker
- identity: when FlatPay (broker) is configured, InitiateZarinPalAsync routes through pay.flatrender.ir instead of calling ZarinPal directly; new HandleBrokerCallbackAsync confirms the payment via the broker inquiry API (authoritative, not trusting the redirect) and activates the plan. New public endpoint GET /v1/payments/callback/broker (already public at the gateway via /callback/*). Env-gated — empty FlatPay__ApiKey keeps the legacy direct-ZarinPal path. - broker: deliver webhooks inline on enqueue (best-effort) in addition to the retry loop, so clients credit near-instantly (db.GetWebhook + goroutine kick). - compose + ENV_FILE: FlatPay__* for identity (FLATPAY_FLATRENDER_*). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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@@ -9,10 +9,17 @@ public interface IPaymentService
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Task<PaymentResponse> GetByIdAsync(Guid paymentId, Guid userId);
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// ── ZarinPal ────────────────────────────────────────────────────────────────
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/// <summary>Calls ZarinPal request API and returns the zarinpal.com redirect URL.</summary>
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/// <summary>Calls ZarinPal request API and returns the zarinpal.com redirect URL.
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/// When the FlatRender Pay broker is configured, routes through it instead
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/// (the broker owns the single ZarinPal-verified domain pay.flatrender.ir).</summary>
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Task<string> InitiateZarinPalAsync(Guid paymentId, Guid userId);
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Task<string> HandleZarinPalCallbackAsync(string authority, string status);
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// ── FlatRender Pay broker (pay.flatrender.ir) ─────────────────────────────────
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/// <summary>Confirms a broker payment via the inquiry API and activates the plan.
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/// Called from the broker's return redirect (/v1/payments/callback/broker).</summary>
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Task<string> HandleBrokerCallbackAsync(Guid paymentId, string brokerTxnId);
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// ── SnapPay ──────────────────────────────────────────────────────────────────
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/// <summary>Calls SnapPay token API and returns the snappay.ir redirect URL.</summary>
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Task<string> InitiateSnapPayAsync(Guid paymentId, Guid userId);
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