Routing retrieve 403 forbidden

I've created route with method - POST and full access. When I create request drupal retrieve me 403 forbidden error. maybe someone knows what might be the problem?

siftandpick_payment.default_controller_getValue:
  path: '/payment/get'
  defaults:
    _controller: '\Drupal\siftandpick_payment\Controller\DefaultController::getValue'
    _title: 'getValue'
  methods: [POST]
  requirements:
    _access: 'TRUE'