To prevent synthetic accounts from joining your affiliate program enable reCAPTCHA in your LeadDyno account. 

Visit Website - Settings - Additional Settings. Click the checkbox next to Require reCAPTCHA on Signup Form and click SAVE.

Generate your own set of V2 keys by visiting reCAPTCHA. Click Admin Console to register your site. 

Enter a Label (anything you want, e.g. My Website), Select reCAPTCHA v2 (v3 will not work). For the Domains, enter leaddyno.com if your affiliate program is hosted by LeadDyno. If you use a custom domain enter your own domain name. Accept the reCaptcha Terms of Service and click Submit.

Copy the site and secret key.

Paste the key and secret under Website - Settings - Custom Domain reCAPTCHA Keys and click Save all Changes.

Visit your affiliate website and validate that the CAPTCHA is enabled.