Request a free D-U-N-S number from Dun & Bradstreet to open your D&B file.
The D-U-N-S number is the key your PAYDEX and trade history are filed under at D&B.
Request it free directly at dnb.com. Do not pay for expedited "credit builder" upsells to get the number itself.
Source: Dun & Bradstreet (dnb.com)
FREE, directly from Dun & Bradstreet
Reported on-time payments are the raw material of a business credit file. Tradelines that don't report do nothing.
This is general business-credit education, not financial, legal, or tax advice. Confirm specifics with a licensed professional and the official sources directly.