CONTPAQi: Invoice Stamping Errors and PAC Connection Troubleshooting

Invoice Stamping Error in CONTPAQi

CONTPAQi is one of Mexico’s most widely used business management systems. A common problem is the system’s inability to stamp (digitally seal) electronic invoices, preventing valid fiscal receipt issuance.

Prerequisites

Updated CONTPAQi with Internet connection.
Available stamps (folios).
Valid Digital Seal Certificate (CSD).

Common Errors and Solutions

1. “Could Not Connect to the Stamping Service”

Verify Internet, firewall (port 443), PAC status, and restart CONTPAQi services.

2. “Stamps Depleted”

Purchase more stamps through your authorized distributor or at tienda.contpaqi.com.

3. “CSD Not Valid” or “Certificate Expired”

Generate new digital seals from the SAT portal using your e.firma and reconfigure in CONTPAQi.

4. “Receiver Data Validation Error”

Request the receiver’s updated Tax Status Certificate and verify all fields match exactly.

Prevention

Monitor your stamp balance.
Renew your CSD before expiration (4-year validity).
Keep CONTPAQi updated.

Frequently Asked Questions

Why can't CONTPAQi stamp my invoices?

Common causes are: no Internet connection, PAC service is down, contracted stamps are depleted, Digital Seal Certificate (CSD) is expired or revoked, or receiver data doesn't match SAT records.

How do I check if I have stamps available in CONTPAQi?

Go to Help > About or Configuration > Stamps/Folios to see your available stamp balance. If depleted, purchase more through your authorized CONTPAQi distributor.

What if the error says 'Could not connect to the stamping service'?

Verify Internet connection, check firewall isn't blocking port 443, confirm PAC service status on their website, and restart CONTPAQi services from the Service Manager.