Create signup proforma invoice

Creates a proforma invoice to preview costs before a subscription's signup. This endpoint is only available for Relationship Invoicing sites and cannot be used to create consolidated proforma invoices or preview prepaid subscriptions. Like other proforma invoices, it can be emailed to the customer, voided, and publicly viewed on the chargifypay domain.

Pass a payload that resembles a subscription create or signup preview request. For example, you can specify components, coupons/a referral, offers, custom pricing, and an existing customer or payment profile to populate a shipping or billing address.

A product and customer first name, last name, and email are the minimum requirements. We recommend associating the proforma invoice with a customer_id to easily find their proforma invoices, since the subscription_id will always be blank.