OptionaldeferredDeferred account argument references for downstream composition
(only set when deferShare = true).
OptionalsponsorSponsor signature returned for a sponsored transaction, if any.
Serialized transaction kind for creating the account.
Response from the create-account endpoint.
When
deferShareis false (default), returnstxKindand optionallysponsorSignature. WhendeferShareis true, additionally returnsdeferredwith argument references for PTB composition.