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2CO Callback?


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I don't get call back from 2co when new clients pay using 2co.

Also, I don't get call back when existing clients pay using 2co, so I always manually mark invoices.


How can I setup? I tried to find it, but I got no luck.

I just input 2co vendor account # to whmcs payment configuration.



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But I don't see [secret word] section under whmcs payment gateway configuration.


[For added security, on the same page you can set a "Secret Word". If you set this, in the payment gateway configuration page of your WHMCS system, enter the same secret word so that WHMCS can verify that the callbacks it receives are coming from 2CheckOut.]

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