Each category has its own specific rules, but requirements that apply to many categories include:
Being on the professional selling plan
Completion of the application form
Good performance metrics, which generally means:
Order Defect Rate less than 1%
Pre-Fulfillment Cancellation rate less than 2.5%
Late Shipment Rate less than 4%
Evidence of authenticity (such as proof that your suppliers are licensed dealers)
Acceptable invoices for your inventory
A company website