in src/main/scala/ZuoraService.scala [225:232]
def createInvoiceItemAdjustment(accountId: String, invoiceItemAdjustment: InvoiceItemAdjustment): String \/ CreateInvoiceItemAdjustmentResult = {
logInfo(accountId, s"attempting to process invoice item adjustment with the following details: ${invoiceItemAdjustment}")
val body = RequestBody.create(MediaType.parse("application/json"), Json.toJson(invoiceItemAdjustment).toString)
val request = buildRequest(config, s"action/create").post(body).build()
val call = restClient.newCall(request)
val response = call.execute
convertResponseToCaseClass[CreateInvoiceItemAdjustmentResult](accountId, response)
}