Looking for logging into the Rest Api site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Rest Api site. After that you can login as usual with your login credentials.
https://mbaas.nifcloud.com/doc/current/rest/user/userLogin.html
https://qiita.com/hokaccha/items/7254579330c2d5b4f39d
https://stackoverflow.com/questions/13916620/rest-api-login-pattern
https://www.bokukoko.info/entry/2015/12/20/%25E8%25AA%258D%25E8%25A8%25BC%25E3%2582%2592%25E5%2590%25AB%25E3%2582%2580_API_%25E9%2596%258B%25E7%2599%25BA%25E3%2581%25A7%25E6%25A4%259C%25E8%25A8%258E%25E3%2581%2599%25E3%2581%25B9%25E3%2581%258D%25E3%2581%2593%25E3%2581%25A8
https://www.ibm.com/support/knowledgecenter/ja/SSFKSJ_9.0.0/com.ibm.mq.sec.doc/q128720_.htm
http://www.google.co.jp/url?url=http://documentation.commvault.com/commvault/v11/article%3Fp%3D45578.htm
https://medium.freecodecamp.org/build-restful-api-with-authentication-under-5-minutes-using-loopback-by-expressjs-no-programming-31231b8472ca
https://developer.atlassian.com/cloud/jira/platform/jira-rest-api-basic-authentication/
http://www.google.co.jp/url?url=http://restcookbook.com/Basics/loggingin/
https://ja.wp-api.org/guide/authentication/
https://v2.wp-api.org/guide/authentication/
https://devcenter.kinvey.com/rest/guides/users
http://www.google.co.jp/url?url=http://blog.restcase.com/restful-api-authentication-basics/