How to send an multiple value with post request using spring boot webclient?

See more:

Java

REST

API

Spring

client-server

As you can see, in my service layer this method send post request like client to the server using Spring Boot WebClient framework, but I have getting a problem, which as you can see my method accept 4 params, which you see and I want to send these only 3 params to the server. I wonder how to set multiple params to send using WebClient? What method support this?

@Override
public Mono<ResponseEntity<? extends ResponseResource>> sendSms(String message, List<BulkSmsRequestResource> request, String originatorName, String sendSmsApi) {
    if (request == null) {
        return Mono.just(new ResponseEntity<>(
                new ErrorResponseResource(
                        "Transaction failed successfully!",
                        400),
                HttpStatus.BAD_REQUEST));
    }
    Mono<BulkSmsRequestResource> bulkSmsRequestResourceMono = webClientBuilder.build()
            .post()
            .uri(sendSmsApi)
            .body(Mono.just(request), BulkSmsRequestResource.class)
            .retrieve()
            .bodyToMono(BulkSmsRequestResource.class);
    bulkSmsRequestResourceMono.subscribe();
    return Mono.just((new ResponseEntity<>(new SuccessResponseResource("Transaction done successfully", 200), HttpStatus.OK)));
}

What I have tried:

I tried to send in bulk using the Collection library, but I couldn't.