Can't use POST integration

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We are building a process for a client and have stumbled upon a problem when trying to use an integration. We have got the GET, PUT and DELETE integrations to work, but can't use the POST integration. When we do, the instance faults and rolls back, giving us this error message: 

<auditQueryPayload auditId="16226" ciKey="180196" xmlns="http://xmlns.oracle.com/bpmn/engine/audit"&gt; <dataState> <dataObject name="FaultMessage" isBusinessIndicator="false"> <value> <bpelFault><faultType>0</faultType><bindingFault xmlns="http://schemas.oracle.com/bpel/extension"><part name="summary"><summary>Unauthorized</summary></part><part name="code"><code>401</code></part><part name="detail"><detail> URL =