WC duplicate order / email noti

WC default Paypal has problem

https://github.com/woocommerce/woocommerce/issues/13963

https://github.com/woocommerce/woocommerce/issues/12467

https://stackoverflow.com/questions/2836779/ipn-vs-pdt-in-paypal

https://github.com/woocommerce/woocommerce/issues/14541
Section
@prikhi @aeadvertising @MillerMedia we have a solution planned for WC 3.2.

Yup checked the code. This can happen if you return at the same time as the IPN request coming in separately. Since there is no locking, both updates occur simultaneously. We'll need #15780 to resolve this. If IPN is working, PDT can be disabled for now.

#15780 has many long and valuable discussion about PayPal IPN, PDT, locking mechanism, cronjob ...

https://wordpress.org/support/topic/urgently-need-help-with-duplicate-orders/

https://github.com/woocommerce/woocommerce/issues/15951

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