#allow access from paypal only
SetEnvIf Referer "^https://www\.paypal\.com" auth_referral
Order Allow,Deny
Deny from all
AuthType Basic
AuthName "FRBSF"
AuthUserFile "/path/to/my/.htpasswds/public_html/passwd"
Require valid-user
Allow from paypal.com
Allow from env=auth_referral
Satisfy any
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