STEP 1 - Request a D-U-N-S number (Dun & Bradstreet)
As a prerequisite to registering with Apple, your company needs to have a valid D-U-N-S number. See here for full details:
It will take approximately 5 business days for Dun & Bradstreet to process your request and issue your D-U-N-S number, so you should place this request as soon as possible.
Before enrolling, look up your organization to see if you have a D-U-N-S Number. Dun & Bradstreet may have already assigned one to you. If your organization is not listed, you'll have the option to submit your information to D&B for a free D-U-N-S Number.