Provides a preview of an online order as if it was purchased.
The previewOnlineOrder() function returns a Promise that resolves to a temporary preview of the online order.
The buyer must be logged in to preview an online order.
The preview uses the same logic as purchasing a plan, but the preview is not saved. Because an order
is not actually created, the preview's _id and subscriptionId properties are displayed as a string of
multiple zero characters (000000-0000).
If taxes are configured for the site, taxes are applied to the preview. If not, the tax previews asnull.
You can preview the order to check purchase limitations, but the limitations are not enforced for the preview.
If a pricing plan has a limit on the amount of purchases per buyer, that limit is not considered for
generating the preview. But, if that limit has been reached and this order would then exceed the amount
of purchases permitted for this buyer, then purchaseLimitExceeded will return as true.
This function is available to the site owner and the buyer. Because the buyer is logged in,
you do not need to specify the buyerId when previewing an online order. To get a general price preview
for a plan that's not buyer-specific, use the previewPrice() function.
ID of the plan to be previewed.
Additional options for previewing the online order.