Billing plan patch: HTTP 400 - Invalid Path provided - paypal

Question

I'm trying to delete all CREATED business plans:
for (Plan plan : created.getPlans()) {
List<Patch> patchRequestList = new ArrayList<>();
Map<String, String> value = new HashMap<>();
value.put("state", "DELETED");
Patch patch = new Patch();
patch.setPath("/v1/payments/billing-plans/" + plan.getId());
patch.setValue(value);
patch.setOp("replace");
patchRequestList.add(patch);
plan.update(apiContext, patchRequestList);
}
but all I'm getting is:
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: https://api.sandbox.paypal.com/v1/payments/billing-plans/P-8SX60559PJ5455037EICJEYY
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1889)
According to the documentation I think I'm doing it correct. However, I've tried
patch.setPath("/v1/payments/billing-plans/" + plan.getId());
patch.setPath("/v1/payments/billing-plans");
patch.setPath("/payments/billing-plans);
etc. but none of these are working.
What am I doing wrong?

Answer 1

Well, I confused things a bit. The documentation says
{
"path": "/",
"value": {
"state": "ACTIVE"
},
"op": "replace"
}
and they really mean that:
Patch patch = new Patch();
patch.setPath("/");
patch.setValue(value);
patch.setOp("replace");
and of course it makes sense. Why would you set the path since
plan.update(apiContext, patchRequestList);
will do that for you already. I guess patch.setPath() is here to set an additional relative path.
Now you know.