Details of the allowances that the taker must set in order to execute the swap successfully. Null if no allowance is required.
The current allowance of the fromToken by the taker.
fromToken
taker
^\d+$
The 0x-prefixed address of to set the allowance on.
^0x[a-fA-F0-9]{40}$
Details of the allowances that the taker must set in order to execute the swap successfully. Null if no allowance is required.