To upload the bridge to Magento Commerce cloud stores and make it available on the URL, the store developer should do the following steps:
1) Add the bridge folder to the project root directory via GIT:
2) Edit the file .magento.app.yaml:
Add the following configurations:
"/bridge2cart":
root: "/"
passthru: "/bridge.php"
index:
bridge.php
expires: -1
scripts: true
allow: true
3) Push changes to the repository and merge them to master.