User ID is the identification to identify who you are in the Rakuten website.
You can also specify an E-mail address that is currently used as the "User ID".
※Enter six or more single-bite alphanumeric characters
※You cannot register the "User ID" which has been already registered by other user.
※You cannot use single-bite Katakana or machine-dependent characters.
What is "User ID"?
![社会的責任[CSR]](/resource/1682465675000/RRR_MSResource/image/r_csr.png){kind=small}
