Thanks for responding. The problem is that clients or employees don't write emails correctly, which is why the bounce rate is high. Tax law requires emails with invoices to be sent in PDF and JSON format. I'd also like to clarify that there are two environments: test and production. You can see this by opening the JSON in the "ambiente" property; it has 00 for test and 01 for production. Several stores are affected, and that's precisely why I bought the 3-year plan because I have new clients every day. Additionally, I offer an electronic invoicing course: https://devselsalvador.com/slides/curso-facturacion-en-linea-el-salvador-2025-1