Missing parent_payment field in the sale response

[500px_info]

Hi, I'm trying to identify the refund id of a completed sale.  According to the API doc, I should find the original sale by id,  get parent_payment, and then list of transactions related to the payment.  However, I got stuck in the second step: there is no parent_payment field in the response of sale object.  The live API debug id is 907c7cb6d1853

[haroldpogix3m]

Any solution for this? I got 2 live sales without the parent_payment

[blanck]

Any Solution to this?

I too dont get the parent_payment for some of my payments (ebay,shop paypal Express) but I do get it for paypalplus