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using PP Website Std, COWA

Am having problems with IPN using website payments standard and am looking at switching to PP Express. Have the description and am wondering if PP Express and COWA are compatible.

Using the IPN I am finding that intermittently we have orders show up in Admin with no products listed. Have checked orders_products table and there are no products listed the for the orders in question. Can only assume something went wrong with the IPN process and the table was not updated (not were the customary emails sent to the customer).

After reading many, many reports of problems with IPN I am thinking that Express might get around these problems. But I am concerned that Express and COWA will conflict.

BTW - had a long conversation with PP Support today and they claim that switching to Express will not make a difference. I find that hard to believe since Express provides an immediate response when the payment is completed, if I am reading the information correctly.

Any assistance will be appreciated ;>

Rich