Errors, Warnings, and Notices

My debug log is getting filled with notices:

PHP Notice:  Undefined index: HTTP_USER_AGENT in /wp-content/plugins/dsidxpress/api-request.php on line 64
PHP Notice:  Undefined index: PropertyID in /wp-content/plugins/dsidxpress/client-assist.php on line 210
PHP Notice:  Undefined index: body in /wp-content/plugins/dsidxpress/client-assist.php on line 221
PHP Notice:  Undefined index: response in /wp-content/plugins/dsidxpress/client.php on line 311
PHP Notice:  Undefined index: body in /wp-content/plugins/dsidxpress/client-assist.php on line 561
PHP Notice:  Undefined index: response in /wp-content/plugins/dsidxpress/shortcodes.php on line 41
PHP Notice:  Undefined index: response in /wp-content/plugins/dsidxpress/shortcodes.php on line 44
PHP Notice:  Use of undefined constant mlsnumber - assumed 'mlsnumber' in /wp-content/plugins/dsidxpress/shortcodes.php on line 45

I have a ton of other similar lines but these are the unique ones. I could turn off debugging entirely but I thought I’d bring these to devs attention to maybe get fixed.

https://wordpress.org/plugins/dsidxpress/