Optional
customerThe email of the user. If undefined, RevenueCat will ask the customer for their email.
Optional
htmlThe HTML element where the billing view should be added. If undefined, a new div will be created at the root of the page and appended to the body.
Optional
purchaseThe option to be used for this purchase. If not specified or null the default one will be used.
The package you want to purchase. Obtained from Purchases.getOfferings.
Parameters used to customise the purchase flow when invoking the
.purchase
method.