When there are multiple MIDs, is it necessary to link a user account by MID? January 19, 2022 18:37 It is necessary to link by connection client (APIKEY/SECRET). Once 1 MID is linked to user account, no linkage is needed for other MIDs. Related articles Is the webhook always delivered? Is it possible to cancel the connection between the user and PayPay from the merchant side? Comments 0 comments Please sign in to leave a comment.