A client-supplied unique identifier (ideally a UUID) for this transaction used to prevent duplicate payments and help confirm the transaction's final status. All ASCII printable characters are allowed. Note that 256-bit hex strings are disallowed because of the potential confusion with transaction hashes.
A character vector where each element must match the regular expression
"^(?!$|^[A-Fa-f0-9]{64})[ -~]{1,255}$"
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