internal/

Package activation implements the billing-domain stages of the paid-order activation saga: the recharge wallet credit, the referral commission and the final settlement.

Package adminorder implements the admin-side order management subdomain of the billing module.

Package adminpayment implements the payment-method management subdomain of the billing module.

Package callbacks implements the payment gateway callback subdomain of the billing module: it authenticates EPay/Stripe/Alipay/Cryptomus notifications, verifies them against the order's immutable payment expectation, re-confirms with the gateway and settles the payment.

Package checkout implements the user-facing money flows of the billing module: purchase, renewal, traffic reset, recharge, order preview and close.

Package coupon implements the coupon management subdomain of the billing module.

Package portal implements the guest storefront subdomain of the billing module: guest pre-orders, gateway/balance checkout, order status polling with session exchange, and the public plan/payment listings.

Package settle holds the one settlement primitive shared by the checkout and payment-callback subdomains: marking a gateway-verified payment as paid and enqueueing activation.

Package userorder implements the user-facing order query subdomain of the billing module (the checkout flows join as migration proceeds).

Package v2 implements the V2 order orchestration subdomain of the billing module: idempotent create-and-checkout, guest checkout capabilities and the SSE event-stream tickets.

Package wallet implements the user-facing wallet subdomain of the billing module: commission withdrawal, balance/commission statements and the affiliate earnings overview.