> For the complete documentation index, see [llms.txt](https://docs.delos.financial/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.delos.financial/validation/transaction-creation.md).

# Transaction creation

### General principle

The request body for creating a transaction has the same shape for every type, but the valid values and combinations of the `paymentType`, `sourceRequisit`, and `destinationRequisit` fields depend on the value of the `type` field. Below is how to correctly build a request for each type.

***

### Type `EXCHANGE` — currency exchange

How to build the request:

1. Set `type: "EXCHANGE"`.
2. `paymentType` must always be set to `"EMPTY"`.
3. `sourceRequisit.account` and `destinationRequisit.account` must reference two different accounts that are in **different currencies**. The same account cannot be used for both source and destination.
4. `sourceRequisit.account`  must belong to `customerId`.

Example of a valid request:

```json
{
  "customerId": "DHgsZkC-rvmu-0HYxwr1B65nD",
  "paymentType": "EMPTY",
  "type": "EXCHANGE",
  "sourceRequisit": {
    "account": "Usco8JZs2Nfo"
  },
  "destinationRequisit": {
    "account": "EOdGnNNGgjbd"
  },
  "amount": {
    "units": "1",
    "nanos": 0
  }
}
```

***

### Type `TRANSFER` —  transferring funds between own or other customers’ accounts within our system.

How to build the request:

1. Set `type: "TRANSFER"`.
2. `paymentType` must always be set to `"EMPTY"`.
3. `sourceRequisit.account` and `destinationRequisit.account` must reference two different accounts that are in **the same currency**.
4. `sourceRequisit.account`  must belong to `customerId`.

Example of a valid request:

```json
{
  "customerId": "DHgsZkC-rvmu-0HYxwr1B65nD",
  "paymentType": "EMPTY",
  "type": "TRANSFER",
  "sourceRequisit": {
    "account": "Usco8JZs2Nfo"
  },
  "destinationRequisit": {
    "account": "UOdGnNNGgjbd"
  },
  "amount": {
    "units": "1",
    "nanos": 0
  }
}
```

***

### Type `WITHDRAW` — withdrawal to a beneficiary

How to build the request:

1. Set `type: "WITHDRAW"`.
2. `paymentType` **cannot** be `"EMPTY"` — it must be set to the value matching the support rail (payment system) of the beneficiary's account, for example `"SWIFT"`.
3. `destinationRequisit` must always be described via the `beneficiar` field (not `account`) — it holds the recipient's account.
4. `sourceRequisit.account`  must belong to `customerId`.

Example of a valid request:

```json
{
  "customerId": "DHgsZkC-rvmu-0HYxwr1B65nD",
  "paymentType": "SWIFT",
  "type": "WITHDRAW",
  "sourceRequisit": {
    "account": "Usco8JZs2Nfo"
  },
  "destinationRequisit": {
    "beneficiar": "UOdGnNNGgjbd"
  },
  "amount": {
    "units": "1",
    "nanos": 0
  }
}
```


---

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