[paypal] request body is array

[Alice52]

@iGoogle-ink

docs

1. https://developer.paypal.com/docs/api/orders/v2/#orders_trackers_patch

2. which request body is raw array, so how do this by gopay.BodyMap, which is map: type BodyMap map[string]any

   [
       {
           "op": "add",
           "path": "/notify_payer",
           "value": true
         }
   ]

[iGoogle-ink]

好问题，看样子需要优化了