A unique ID for the transaction in the partner's system.
Used to track the purchase and stored as transactionId and
transactionItemId on the enrollment.
If not provided, the enrollment request ID is used as the default.

A unique ID for the transaction item in the partner's system.
Used to track individual items within a transaction and stored as
transactionItemId on the enrollment. This value enforces idempotency —
accept-quote requests reusing the same transactionItemId for the same offer
will be rejected as duplicates rather than creating additional coverages.

If not provided, a fallback key is derived from the quote's partner and
cart context: partnerId_cartId_cartItemId (or partnerId_cartId when
cartItemId is absent) so repeated requests for the same cart item still
resolve to the same enrollment.

Appends to the product name in the claims flow to help identify the coverage. For example, if the product name is “Half Marathon” and the participant description is “Jane Doe”, the customer will see “Half Marathon - Jane Doe” in their Spot account.

If a non-empty value is provided here, it takes precedence over any participantDescription supplied in the original quote request. If omitted or empty, the value from the quote request (if any) is used.

Optional webhook URL to receive enrollment status updates for this enrollment.
When provided, overrides the partner's stored webhook configuration for the
lifetime of this enrollment. The HMAC signature on the request body is still
computed with the partner's configured HMAC secret.

Spot Provided ID for Partner