Transfer a code part (file cloud storage APIs) from old version to new version of a website -- 2

Hi, I need someone who much be very strong in PHP to help me transfer the file cloud storage APIs from old version to new version of our website. Our website is a Laravel website that we store file in backblaze (a cloud storage similar amazon S3). We have made a module to store files in backblaze cloud in the old version of our website, but now we have a new version of website and we want to transfer that module from old version to new version (I will provide you the old version for reference) You can take a look of this module in the attachment... and here is the Backblaze APIs for reference [login to view URL] (we already made all in the module, we just need to integrate it to new version of our website) Make sure: - Files upload/download/delete from our website to B2 bucket work ok. - File of separate user will be stored in different folders in the bucket (B2) - File remove from Trash work ok - When we delete a user => whole file of that user (their folder in the bucket) will also be deleted from the bucket Thanks for reading!