How does paypal confirm receipt?

It is a third-party website using paypal payment process, but there are several issues unclear. I have a self-built online shop to sell things and want to use payapl for collection, which version of paypal service is required? Paypal uses ipn to return payment information, but my personal paypal account cannot find ipn settings. Please...

It is a third-party website using paypal payment process, but there are several issues unclear.

1. I have a self-built online shop to sell things and want to use payapl for collection, which version of paypal service is required?

2. Paypal uses ipn to return payment information, but my personal paypal account cannot find ipn settings. Where can I find it?

3. To ensure that the payment status returned by ipn is reliable, how can I set multiple return times?

@ Paypal business consultant service @ PayPal_Jasmine

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It is a third-party website using paypal payment process, but there are several issues unclear.

1. I have a self-built online shop to sell things and want to use payapl for collection, which version of paypal service is required?

2. Paypal uses ipn to return payment information, but my personal paypal account cannot find ipn settings. Where can I find it?

3. To ensure that the payment status returned by ipn is reliable, how can I set multiple return times?

@ Paypal business consultant service @ PayPal_Jasmine