I need Perfex CRM to speak directly with the Saudi ZATCA API so every invoice, estimate, and expense is automatically tax-compliant. The work includes: • Integrating the ZATCA tax endpoints into the Invoices, Estimates, and Expenses modules. • Automating tax calculation, e-invoicing validation, and one-click tax report generation. I want the reports delivered in PDF. • Synchronising all existing Customer data, Historical invoices, and Expense records with ZATCA so our past and future data stays consistent. Expect clean, well-documented full-stack code that fits Perfex’s structure, plus clear deployment instructions so I can move from staging to production without friction. If you have proven experience with Perfex CRM, the ZATCA API, and data-sync automation, this should be a straightforward build.