Calls an endpoint to start a transaction.
This endpoint requires a type url parameter. All transaction types are defined in the project configuration file and use a strategy. To understand how strategies work and their effect on the transaction process, we recommend you to read more about strategies.
The currency parameter defines the currency code and amount used for this transaction.It may contain additional data that explains the exchange between fiat currency and coin.
participants takes a list of key-value pairs in the form of the role of the user corresponding to the key and their user id as the value.
Additional properties that are specific to a particular transaction can be added via the additionalProperties parameter. For example, it could be used to add remarks about the transaction in the form of a comment.

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