Transfer
To accomplished user's transfer, FE(front-end) needs to do the following things:
  1. 1.
    Get basic transfer configs to get correct user' input for assets transfer
  2. 2.
    After collecting all needed information, always get updated estimation for the transfer.
  3. 3.
    Check user's on-chain token allowance for cBridge contract. If the allowance is not enough for user token transfer, trigger the corresponding on-chain approve flow
  4. 4.
    Submit on-chain transfer request to cBridge contract on source chain
  5. 5.
    Get transfer status repeatedly to check whether the transfer is complete.
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