/{payment-id} /dispute

POST /v24.0/{payment-id}/dispute HTTP/1.1
Host: graph.facebook.com
reason=DENIED_REFUND

/* PHP SDK v5.0.0 */
/* make the API call */
try {
 // Returns a `Facebook\FacebookResponse` object
 $response = $fb->post(
 '/{payment-id}/dispute',
 array (
 'reason' => 'DENIED_REFUND',
 ),
 '{access-token}'
 );
} catch(Facebook\Exceptions\FacebookResponseException $e) {
 echo 'Graph returned an error: ' . $e->getMessage();
 exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
 echo 'Facebook SDK returned an error: ' . $e->getMessage();
 exit;
}
$graphNode = $response->getGraphNode();
/* handle the result */

Bundle params = new Bundle();
params.putString("reason", "DENIED_REFUND");
/* make the API call */
new GraphRequest(
 AccessToken.getCurrentAccessToken(),
 "/{payment-id}/dispute",
 params,
 HttpMethod.POST,
 new GraphRequest.Callback() {
 public void onCompleted(GraphResponse response) {
 /* handle the result */
 }
 }
).executeAsync();

NSDictionary *params = @{
 @"reason": @"DENIED_REFUND",
};
/* make the API call */
FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
 initWithGraphPath:@"/{payment-id}/dispute"
 parameters:params
 HTTPMethod:@"POST"];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
 id result,
 NSError *error) {
 // Handle the result
}];