Where can I find examples of XMLs for simplified and standard invoices, as well as examples of PDF/A3 files with embedded XMLs?
You can download sample files, including XMLs for simplified and standard invoices, as well as PDF/A3 files with embedded XMLs, from the following link: https://sandbox.zatca.gov.sa/downloadSDK
XML and PDF A/3 samples can be found in the SDK in the folder Data → Samples.
Latest SDK can be downloaded from https://sandbox.zatca.gov.sa/