How to legalize escrow-like service on the website?

Good day!
Lord, tell me pliz. We are developing a service that has sellers and buyers. There is a mechanism, reminiscent of escrow as on aliexpress or on odesk: the buyer deposits money into our account, wait for delivery and then confirms the transaction, then the money is transferred to the seller. This may apply or not to apply a certain percentage in our favor (in addition to the percentage charged by the banks / payment services). Prompt, please, as correctly legally issued similar service? Do I need to obtain some licenses, to execute documents on personal data retention, etc.? Is the procedure if we don't charge a percentage? What is the type of business this is more acceptable (PI, OOO)? In the case of a conflict - what level of arbitration is required - will it be enough to make the decision at the discretion of the technical support of the website, or have a legally sound decision (i.e., you need a lawyer in the team)?
Sorry for nobska questions himself in the legislative side do not rummage at all.
September 19th 19 at 12:15
1 answer
September 19th 19 at 12:17
"safe transaction"

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