Service configuration

YourApiService

package org.example.services;

import com.fasterxml.jackson.databind.JsonNode;
import io.restassured.RestAssured;
import io.restassured.builder.RequestSpecBuilder;
import io.restassured.http.ContentType;
import io.restassured.response.Response;
import io.restassured.specification.RequestSpecification;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

@Slf4j
@Service
public class YourApiService {

    private RequestSpecification spec;

    @PostConstruct
    protected void init() {

        // On init you can set some global properties of RestAssured
        RestAssured.useRelaxedHTTPSValidation();

        spec = new RequestSpecBuilder().setBaseUri("https://reqres.in").setBasePath("/api").build();
    }

    public Response postRequest(String endpoint, JsonNode requestBody) {

        return RestAssured.given(spec)
            .contentType(ContentType.JSON)
            .body(requestBody)
        .when()
            .post(endpoint);
    }
}