Ultimate Multisite: FluentAffiliate Integration

Track recurring commissions in FluentAffiliate for every Multisite Ultimate membership renewal — gateway-agnostic. This addon bridges Multisite Ultimate (formerly WP Ultimo) and FluentAffiliate to enable automatic recurring commission tracking for subscription renewals. The problem it solves: FluentAffiliate tracks the initial payment at the form submission layer. But recurring subscription renewals happen at the gateway webhook layer (Stripe, PayPal, etc.), which is invisible to FluentAffiliate. This addon closes that gap. Features: Recurring commission tracking — Stores the affiliate ID on the membership at signup, then fires a commission on every renewal payment. Gateway-agnostic — Hooks at the payment model layer (wupaymentpostsave), not at the Stripe gateway layer. Works with Stripe, PayPal, Manual, and all other gateways. Manual affiliate assignment — Admins can manually assign or change the affiliate for any membership via the membership edit page. Refund handling — Marks commissions as refunded when a payment is refunded. Extensible — Provides filters and actions for custom commission logic. FluentAffiliate API used: FluentAffiliate\App\Models\Affiliate — affil