Wordpress cron job settings -


please on issue.i see code in https://codex.wordpress.org/function_reference/wp_cron ,but don't under stand how use in current situation .

in website there plans can purchase using paypal form . when customer buy plan(something monthly subscribe ) wordpress website , pay amount redirected specific page (because set return url in paypal form .) of website , in page id of paln(post) purchased. need set cron job here . when returned specific page need set cron job in after 29 days mail going customer email saying subscription going end , please pay. after 30 days payment status need rewrite unpaid .how can this? please ? function need write? it's own function.php or specific page?
suggestions?

try link http://generatewp.com/schedule_event/ , make crone code follow general, schedul, , hook

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