@Service
      class BrevoWebhookService() {

      @PostMapping
      fun storeWebhookResponse(@RequestBody webhook: WebhookResponse): ResponseEntity<HttpResponse> {

      webhook.let { web ->
        val user = customerRepository.findByEmailIgnoreCase(web.email)
        user?.let {
            val saveWebhook = StoreWebhookState(
                event = web.event ,
                id = web.id ,
                email = web.email ,
                ts = web.ts,
                date = web.date ,
                tags = web.tags ,
                message_id = web.message_id,
                sending_ip = web.sending_ip,
                template_id = web.template_id,
                subject = web.subject,
                ts_epoch = web.ts_epoch,
                customer = it)
                }
         }

       ....
       *many other stuff*
       ...
      }

Interface:

   @FeignClient(name = "webhook", url = "/api/communication/webhooks")
   interface WebhookInterface {

   @PostMapping("/store")
   fun storeWebhookResponse(@RequestBody webhook: WebhookResponse): 
     ResponseEntity<HttpResponse>
   }