It depends which automation model you have chosen.
Amazon Automation: you won’t need any Credit Line in the first 2 months. And in Month-3 you will need at least $10,000 credit limit to purchase inventory from Brands.
Walmart Automation: Initially you hardly need any credit limit, we’re building your store in the first month, making it ready to grow exponentially. In Month-2 you’ll need at least $5,000 on your credit card, and in Month-3 it should be $10,000+.