Hello. We are currently developing a shopping mall through PHP 5.* and are in the process of linking the PayPal payment module for the first time. I succeeded in linking the payment in SandBox mode, but I have a question so I write a post. We developed the PayPal linkage method by searching the website, but we could not find the linkage for the cancellation and refund method for payment. If possible, can you provide a PayPal cancellation and refund linkage method?
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