## Login [/login]

### Login User -- DONE [POST]

+ Request (application/json)

    + Headers

            Accept: application/json

    + Attributes

        + cardNumber: `123456` (string, required) - only numeric characters, exactly 6 characters
        + password: `secret` (string, required) - minimum 6 characters


+ Response 200 (application/json)

        {
            "data": {
                "accessToken": "eyJ0eXAiOiJ
            }
        }

+ Response 400 (application/json)

        {
            "errors": {
                "userError": [
                    "User doesnt exist for given card number"
                ],
                "credentialsError": [
                    "Incorrect card number and password combination"
                ]
            }
        }
+ Response 422 (VALIDATION ERRORS)

        {
            "message": "The given data was invalid.",
            "errors": {
                "cardNumber": [
                    "The card number field is required."
                ],
                "password": [
                    "The password field is required."
                ]
            }
        }