When there are multiple MIDs, is it necessary to link a user account by MID?

Related articles

• In what unit is recon file generated?
• What is AssumeMerchant?
• If user authorization is performed multiple times by the same PayPay user with the same clientId, does the userAuthorizationId change each time?
• Is it possible to reuse the results of PayPay authentication (user authorization) on multiple devices?
• Is it possible to link multiple merchant accounts to one PayPay account?