To be honest, you don't need to have one. You just need a principal buyer in the transaction. A specialized understanding of the home buying and selling process is an important element to start with.
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Next thing is to find an investor to sell a contract, remember, investors aren't selling the property itself; they are actually selling their right to buy it to someone else.
On one occasion, fortune builders mention that this is what is known as the doctrine of equitable conversion, once a real estate agreement is signed by everyone involved in the wholesale deal, the final buyer becomes the equitable owner. The seller retains the bare legal title to the property under the terms of the agreement.
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So, you don't really need to have a license, all you need is just a seller and an investor!