When your account reaches the limitation number of import products or product sourcing.
You can use E-Coin to exchange the number of Import Products & Product Sourcing from the “Exchange Page”.
You can also use the E-Coin to exchange account balance. (Tips: Account Balance can be used to pay for orders)
Find more detail from below page: https://app.eprolo.com/mshopsetup.htm?flag_int=10