# complete_transfer · FT4 Rell API · Chromia Docs (concept)

> @mount("ft4.crosschain.complete_ transfer")
operation complete_ transfer(final_ apply_ transfer_ tx: gtx_ transaction, op_ index: integer) This operation i

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.external.crosschain/complete_transfer/

OPERATION

# complete\_transfer

```signature
@mount("ft4.crosschain.complete_transfer")
operation complete_transfer(final_apply_transfer_tx: gtx_transaction, op_index: integer)
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/external/crosschain/operations.rell#lines-368)

This operation is to be called on the initial chain (the chain for which a crosschain
transfer originated) once all hops are completed and the transfer has been successfully
delivered to the recipient. Even if this operation is not called, the recipient will still
receive their assets, but calling this operation will allow clients to stop displaying it
as ongoing to the user that sent it.

Anyone can call this operation, but it needs to include an `iccf_proof` operation that the
final `apply_transfer` was performed.

Throws `"`INPUT ERROR"`if`op\_index`does not point to an`apply\_transfer` operation

Throws `"INCOMPLETE TRANSFER"` if the given `apply_transfer` was not called on the last
chain; that is, if the `hop_index` parameter does not correspond to the last hop index.

Throws `"WRONG DESTINATION"` if the given `apply_transfer` was called on a chain that does
not correspond to the `init_transfer`'s last chain in the `hops` parameter

Throws if the transaction is missing the `iccf_proof` operation, which demonstrates that
the block containing the `final_apply_transfer_tx` has been anchored from the target chain.

Requires no flags - no authorization is performed to complete a transfer.

**Parameters**

* **final\_apply\_transfer\_tx** — the transaction that was submitted and applied on the target chain in order to complete the crosschain transfer.
* **op\_index** — the index for the `apply_transfer` operation in question in `final_apply_transfer_tx`

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.external.crosschain/complete_transfer.html)Generated API reference, mirrored from the live docs