I am using this plugin
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It works fine but issue is that after payment EasyPaisa does not send IPN due to which Invocie remains unpaid in WHMCS.
I need a Cron script that using WSDL Open API checks EasyPaisa for PAID tokens and updates WHMCS invoice.
Default function of add invoice method in WHMCS
addInvoicePayment
logTransaction
checkCbTransID
Sandbox account is enabled.
You should have WHMCS programming skills for this job.