commerce_maib.routing.yml

commerce_maib.checkout_return:
  path: '/commerce-maib/return'
  defaults:
    _controller: '\Drupal\commerce_maib\Controller\PaymentCheckoutController::returnPage'
  requirements:
    _custom_access: '\Drupal\commerce_maib\Controller\PaymentCheckoutController::checkAccess'

commerce_maib.checkout_cancel:
  path: '/commerce-maib/cancel'
  defaults:
    _controller: '\Drupal\commerce_maib\Controller\PaymentCheckoutController::cancelPage'
  requirements:
    _custom_access: '\Drupal\commerce_maib\Controller\PaymentCheckoutController::checkAccess'