nGINX rewrite rules for whmcs 8

whmcs-nginx-include-rules.conf

	location ~ /clients/admin/(client!\.php|client/(.*)|table/(.*)|search!\.php|search/(.*)|apps|billing|setup|user|services|addons|domains|utilitiesemailmarketer!\.php|utilities/(.*)|logs|help!\.php|help/license|modules|image/(recent|upload)|validation_com/(.*))/?(.*)$ {
		rewrite ^/(.*)$ /clients/admin/index.php?rp=/admin/$1/$2;
	}

	location ~ /clients/(images/em|invoice|domain|login|invite|password|account|store|download|knowledgebase|announcements|clientarea/ssl-certificates|user/(verification|accounts|profile|password|security|verify)|cart/(domain/renew)|domain/pricing|cart/order|images/kb)/?(.*)$ {
                rewrite ^/(.*)$ /clients/index.php?rp=/$1/$2;
	}
	
	location ~ /clients/auth/manage/client/links/?(.*)$ {
        rewrite ^/(.*)$ /clients/index.php?rp=/auth/manage/client/links$1;
   	}
	
	location ^~ /clients/vendor/ {
	        deny all;
		return 403;
	}

This is my WHMCS block for nginx , tested on WHMCS 8.13.1 (replace /billing with the name of your whmcs folder).
WHMCS support send me to this gist, as always the answer is "we do not support nginx and we have no documentation for it".

location ^~ /billing/vendor/ { deny all; return 403; }
location ^~ /billing/assets/ { try_files $uri $uri/ =404; }
location ^~ /billing/templates/ { try_files $uri $uri/ =404; }
location ^~ /billing/images/ { try_files $uri $uri/ =404; }
location ~ ^/billing/modules {
    try_files $uri $uri/ =404;
    include nginxconfig.io/php_fastcgi.conf;
    fastcgi_pass unix:/var/opt/remi/php83/run/php-fpm/highproxies.sock;
}
# This is your universal catch-all for friendly URLs
location /billing/ {
    try_files $uri $uri/ /billing/index.php?$query_string;
}
# Admin area rewrite (for REST-style URLs)
location ~ ^/billing/admin/(client!\.php|client/.*|table/.*|search!\.php|search/.*|apps|billing|setup|user|services|addons|account/.*|domains|utilitiesemailmarketer!\.php|utilities/.*|logs|help!\.php|help/license|modules|image/(recent|upload)|validation_com/.*)/?(.*)$ {
    rewrite ^/.*$ /billing/admin/index.php?rp=/admin/$1/$2 last;
}
# Client area friendly URLs
location ~ ^/billing/(invite|images/em|invoice|login|password|account|store|download|knowledgebase|announcements|clientarea/ssl-certificates|user/(verification|accounts|profile|password|security|verify)|cart/(domain/renew)|domain/pricing|cart/order|paypal_acdc|paypal_ppcpv|paypal|cryptomusgateway)/?(.*)$ {
    rewrite ^/.*$ /billing/index.php?rp=/$1/$2 last;
}