The below flow returns an error saying wrong credentials. You might need to add them back into the http request node when testing it.
[{"id":"52c04527.c92c2c","type":"http request","z":"ced96e30.86933","name":"","method":"POST","ret":"obj","paytoqs":"body","url":"https://api.owencloud.ru/v1/auth/open","tls":"","persist":false,"proxy":"","authType":"basic","x":1060,"y":580,"wires":[["13d8cd07.428193"]]},{"id":"13d8cd07.428193","type":"debug","z":"ced96e30.86933","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":1210,"y":580,"wires":[]},{"id":"587c6431.95ce3c","type":"inject","z":"ced96e30.86933","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":900,"y":580,"wires":[["52c04527.c92c2c"]]}]