Obtain a Token
Assuming that the special link has been provided to the Legal Entity, the onboarding procedure can be started.
The system has generated an XML file that needs to be signed now. The file contains data such as your company's tax identification number (NIP) and a special one-time identification tag. Due to the limits on by the KSeF platform, the entire process must be completed within 10 minutes. After this time, the XML file, even if properly signed, will not be accepted by the KSeF. You will notice a timer in the upper right corner, counting the time from the moment the Download File button is pressed.
If you will not be able to finish the process within the 10-minute window, you will need to restart it again.
Start

Step 1
Pressing the "Download File" button will save the XML file to your device.

Step 2

Step 3
Depending on the signature platform, it is important to make sure that enveloping the signature method in the XML file is selected.

Step 4

List of Legal Entities

Webhooks
Regardless of the result of the operation, A-Cube Platform will generate an event and notify the proper webhook about the processing status of the onboarding.
You can find out more about Webhooks here