@PostMapping(consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE, value = "/v1/notification")
  public ResponseEntity<String> handleNotifications(@RequestBody MultiValueMap<String, Object> keyValuePairs) {
     .....
    return new ResponseEntity<>(HttpStatus.OK);
  }

@SpringBootApplication(scanBasePackages = { "org.rest.api.*", "org.plugin.service", "org.plugin.transactions.factory" })
@EntityScan("org.plugin.entity")
@EnableJpaRepositories("org.plugin.service")
@EnableScheduling
public class Application extends SpringBootServletInitializer implements WebMvcConfigurer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.removeIf(converter -> converter instanceof MappingJackson2XmlHttpMessageConverter);
        converters.removeIf(converter -> converter instanceof MappingJackson2HttpMessageConverter);
        converters.add(new MappingJackson2XmlHttpMessageConverter(
                ((XmlMapper) createObjectMapper(Jackson2ObjectMapperBuilder.xml()))
                        .enable(ToXmlGenerator.Feature.WRITE_XML_DECLARATION)));
        converters.add(new MappingJackson2HttpMessageConverter(createObjectMapper(Jackson2ObjectMapperBuilder.json())));
    }

    private ObjectMapper createObjectMapper(Jackson2ObjectMapperBuilder builder) {
        builder.indentOutput(true);
        builder.modules(new JaxbAnnotationModule());
        builder.serializationInclusion(JsonInclude.Include.NON_NULL);
        builder.defaultUseWrapper(false);
        return builder.build();
    }
}

<h1>Forbidden <span>(403)</span></h1>
  <p>CSRF verification failed. Request aborted.</p>
  <p>You are seeing this message because this site requires a CSRF cookie when submitting forms. This cookie is required for security reasons, to ensure that your browser is not being hijacked by third parties.</p>
  <p>If you have configured your browser to disable cookies, please re-enable them, at least for this site, or for &#39;same-origin&#39; requests.</p>

@Configuration
@EnableWebSecurity
@Import(value = { Application.class, ContextDatasource.class })
@ComponentScan(basePackages = { "org.rest.api.server.*" })
public class ApplicationSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private RestAuthEntryPoint authenticationEntryPoint;

    @Autowired
    MerchantAuthService myUserDetailsService;

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(myUserDetailsService);
        auth.authenticationProvider(authenticationProvider());
    }

    @Bean
    public DaoAuthenticationProvider authenticationProvider() {
        DaoAuthenticationProvider authenticationProvider = new DaoAuthenticationProvider();
        authenticationProvider.setUserDetailsService(myUserDetailsService);
        authenticationProvider.setPasswordEncoder(passwordEncoder());
        return authenticationProvider;
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
    http.authorizeRequests().antMatchers("/notification").permitAll().anyRequest().permitAll();
        http.httpBasic().authenticationEntryPoint(authenticationEntryPoint);
        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
        http.csrf().disable();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return NoOpPasswordEncoder.getInstance();
    }
}

<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.1.6.RELEASE</version>
</parent>
....
<dependency>
 <groupId>org.springframework.security</groupId>
 <artifactId>spring-security-config</artifactId>
</dependency>
<dependency>
 <groupId>org.springframework.security</groupId>
 <artifactId>spring-security-web</artifactId>
</dependency>