get
The id of the claimable balance the operation at operationIndex created, as a B... strkey.
A fee bump transaction carries no operations of its own, so the inner transaction's operation results are read for it.
Return
the created balance id, or null when the transaction did not succeed, when resultXdr is absent or cannot be decoded, when no operation sits at operationIndex, or when the operation there is not a CreateClaimableBalance
Parameters
operation
the position of the CreateClaimableBalance operation within the transaction, 0 for the first