Commissioning a script in PHP to support KSeF

We would like to commission a script in PHP to handle KSeF, the functions the script would perform:

- authorization in KSeF would be based on the authorization token;

- shipping a single invoice and a package of invoices to KSeF (preparation of XML files for shipping is not included in the scope of work - only file shipping);

- checking the shipping status and downloading the KSeF number for the sent invoices;

- downloading the list of cost invoices saved in KSeF;

Due to the specifics of KSeF's operation, we are most willing to cooperate with someone who has already performed a similar order.