Registers EGS units for clients via API at https://zatcaapi.avtax.net/.
Assigned Client ID & Client Secret to generate Access Token and sends invoices.
Receives invoices, runs 150+ validations, converts to ZATCA XML, signs with EGS certificate, and submits.
Returns QR Code, PDF/A-3, & Signed XML.
Features: Rate limits per EGS unit (monthly/minute) & configurable EGS unit limit per partner.
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