W/System.err: java.lang.SecurityException: Access denied to package [package name here]
W/System.err:     at android.os.Parcel.readException(Parcel.java:1465)
W/System.err:     at android.os.Parcel.readException(Parcel.java:1419)
W/System.err:     at com.clover.sdk.v3.inventory.IInventoryService$Stub$Proxy.deleteModifier(IInventoryService.java:2279)
W/System.err:     at com.clover.sdk.v3.inventory.InventoryConnector$45.run(InventoryConnector.java:410)
W/System.err:     at com.clover.sdk.v3.inventory.InventoryConnector$45.run(InventoryConnector.java:408)
W/System.err:     at com.clover.sdk.v1.ServiceConnector.execute(ServiceConnector.java:196)
W/System.err:     at com.clover.sdk.v3.inventory.InventoryConnector.deleteModifier(InventoryConnector.java:408)

Java API attempt:
Modifier modifier = new Modifier();
List<ModifierGroup> modifierGroupsForItem = inventoryConnector.getModifierGroupsForItem(itemId);
final ModifierGroup modifierGroup = modifierGroupsForItem.get(0);
Reference modGroupRef = new Reference();
modGroupRef.setId(modifierGroup.getId());
modifier.setModifierGroup(modGroupRef);
modifier.setPrice((long)0);
Modifier modifier1 = inventoryConnector.createModifier(modifierGroup.getId(), modifier);
String modifierId = modifier1.getId();
LineItem lineItem = new LineItem();
lineItem = orderConnector.addVariablePriceLineItem(orderId, itemId, payAmount / 10, null, null);
orderConnector.addLineItemModification(orderId, lineItem.getId(), modifier1);
inventoryConnector.deleteModifier(modifierId);

REST API attempt:
String URL= baseUrl + "/v3/merchants/" + merchId + "/modifier_groups/" + modifierGroup.getId() + "/modifiers/" + modifierId;
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpDelete httpDeleteRequest = new HttpDelete(URL);
httpDeleteRequest.setHeader("Accept", "application/json");
httpDeleteRequest.setHeader("Content-type", "application/json");
httpDeleteRequest.setHeader("Authorization", "Bearer " + authId);
HttpResponse response = httpclient.execute(httpDeleteRequest);
HttpEntity entity = response.getEntity();
InputStream instream = entity.getContent();
String resultString= convertStreamToString(instream);
instream.close();
JSONObject jsonObjRecv = new JSONObject(resultString);