In today's globalized world, personalized customer relationship management (CRM) services are becoming increasingly important for overseas stores to attract and retain customers. However, with the rise of cyber threats and identity theft, ensuring user identity security has become a top priority for businesses. One effective way to address this challenge is by using identity authentication technology. Identity authentication technology refers to the process of verifying the identity of a user before granting access to personalized CRM services. This technology can take various forms, including biometric authentication, two-factor authentication, and multi-factor authentication. By implementing these technologies, overseas stores can significantly enhance the security of their CRM services and protect their customers' personal information. Biometric authentication, for example, uses unique physical characteristics such as fingerprints, facial features, or iris patterns to verify a user's identity. This technology is highly secure and difficult to replicate, making it an ideal solution for ensuring user identity security in personalized CRM services. Two-factor authentication, on the other hand, requires users to provide two different forms of identification, such as a password and a one-time code sent to their mobile device. This adds an extra layer of security and reduces the risk of unauthorized access to CRM services. Multi-factor authentication takes this a step further by requiring users to provide three or more forms of identification, such as a password, a fingerprint scan, and a security question. This approach offers the highest level of security and is particularly effective for protecting sensitive customer data in overseas stores. By implementing identity authentication technology, overseas stores can not only enhance the security of their personalized CRM services but also build trust with their customers. When customers know that their personal information is being protected, they are more likely to engage with the store and make repeat purchases. This, in turn, can lead to increased customer loyalty and higher revenues for the business. In conclusion, identity authentication technology is a crucial tool for ensuring user identity security in personalized CRM services for overseas stores. By leveraging biometric authentication, two-factor authentication, and multi-factor authentication, businesses can protect their customers' personal information and build trust with their global customer base. As the threat of cyber attacks continues to grow, investing in identity authentication technology is essential for the long-term success of overseas stores.