@unchainedshop/plugins/tests/mock/datatrans/v1/secure-fields.json

Because of a Typescript issue with upstream "postfinancecheckout", the Postfinance plugin has been disabled from transpilation, import the source ts files from src and enable node_module tsc or copy over the src/payment/postfinance-checkout to your projec

{
  "location": "https://pay.sandbox.datatrans.com/v1/start/new-transaction-secure-fields",
  "transactionId": "new-transaction-secure-fields"
}