Fund the sub-account
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Trades reference the sub-account's collateral balance on the Symmio core. You need balance there before you can open anything.
Signed by: Owner EOA, two transactions.
Function: First, approve(spender = AccountLayer, amount = max) on the collateral token, then depositForAccount(subAccount, amountWei) on the AccountLayer.
depositForAccount (note: not depositAndAllocateForAccount) pulls the collateral from your EOA and credits it to the sub-account's balance on the Symmio core. The AccountLayer signs the inner deposit call to the core on your behalf via its globalSigner mechanism, so from the core's perspective the sub-account is the depositor.
You can re-run this any time you want to top up. You can also withdraw and re-deposit: the sub-account is sticky, the balance isn't.
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