Integrate Paraguay SIFEN e-Invoicing PHP module into Scriptcase POS (Multi-tenant SaaS)

I need to integrate an existing PHP module (already tested standalone, generates/sends XML to SIFEN successfully) into my Scriptcase-based POS SaaS. Each tenant already issues legal invoices (auto-printed). The goal is: after each sale, trigger the module, send to SIFEN, store CDC/response, and print KUDE/QR. Multi-tenant support required (certificates, timbrado, etc. per company)