currency-8.x-3.3/modules/currency_test/currency_test.routing.yml

currency_test.currency_amount_element:
  path: '/currency_test-form-element-currency-amount/{minimum_amount}/{maximum_amount}/{currency_code}'
  defaults:
    _form: '\Drupal\currency_test\CurrencyAmountElement'
    currency_code: ''
  requirements:
    _access: 'TRUE'

currency_test.currency_sign_element:
  path: '/currency_test-form-element-currency-sign/{currency_code}/{currency_sign}'
  defaults:
    _form: '\Drupal\currency_test\CurrencySignElement'
    currency_code: ''
    currency_sign: ''
  requirements:
    _access: 'TRUE'