The value of item_number obtained by IPN after PaypalExpressCheckout is null.

Use the PaypalExpressCheckout interface to integrate setExpressCheckout & amp; doExpressCheckout. after execution, the item_number value in the returned ipn information is blank, so you cannot verify the payment information based on the custom order number. You can use PaypalWPS form parameters to integrate tables... using the Paypal Express Checkout interface.
After setExpressCheckout & doExpressCheckout is executed
In the returned ipn information item_numberIf the value is blank, the payment information cannot be verified based on the custom order number.

You can use Paypal WPS form parameters.item_numberField, which can be obtained by ipn after submissionitem_numberInformation. (The ipn method works normally.

In EC integration, you need to set the nvp parameters in the EC method to passitem_numberObtain the following ipnitem_numberInformation?

The NUMBER-related parameters provided in the document and manual seem to be invalid, including the use of Rochelle numberx.

Please let me know if you are familiar with Paypal quick Checkout (Express Checkout). thank you :)

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Integrate with the Paypal Express Checkout interface
After setExpressCheckout & doExpressCheckout is executed
In the returned ipn informationitem_numberIf the value is blank, the payment information cannot be verified based on the custom order number.

You can use Paypal WPS form parameters.item_numberField, which can be obtained by ipn after submissionitem_numberInformation. (The ipn method works normally.

In EC integration, you need to set the nvp parameters in the EC method to passitem_numberObtain the following ipnitem_numberInformation?

The NUMBER-related parameters provided in the document and manual seem to be invalid, including the use of Rochelle numberx.

Please let me know if you are familiar with Paypal quick Checkout (Express Checkout). thank you :)

Try the custom parameter or the invoice parameter.

Advantages of paypal: convenient and fast, high customer conversion rate; security, high customer recognition rate; wide range of customers, high user support rate; real-time receipt, accelerated capital turnover, with the development of the e-commerce industry, more and more small buyers begin to accept online payment methods. after all, there will be more customers with one more payment method. who knows if the next buyer is a major customer;
Https://www.paypal-biz.com/developer/ paypal integration free code

Hello, have you integrated the WPS method of paypal ??
If it has been integrated, how is your IPN charged? I have been stuck at this point for a long time and cannot solve the problem. The technicians at the paypal company cannot solve the problem .. Thank you. we look forward to your reply !!