Switch Subscription Payment Mode: Auto-Renew ↔ Send Invoice

🔍 Problem Statement
As an admin, I experience having to cancel and recreate a subscription to change a customer's payment mode between auto-renew and send invoice, which disrupts subscription dates and creates unnecessary churn.

💡 User Story
As an admin, I want to toggle a subscription between auto-renew and send-invoice without cancelling it, so that I can honor customer payment preferences without affecting subscription history.

🎯 Definition of Done
- Given an active subscription, when an admin changes the payment mode, then the change is applied without altering subscription start/end dates or renewal history.
- This change impacts the UI (subscription detail actions) and API (subscription update endpoint — add paymentMode field).
- Limitations: switching to send-invoice removes auto-charge; a manual invoice must be triggered at next renewal.

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What would you like to be able to do? (One idea per form): Change payment settings from "auto renew" to "send invoice" and vice versa without needing to cancel the existing subscription. We would like to be able to change the payment terms per customer request without effecting the start and end dates of the subscription. Customers frequently request to remove the auto renewal feature from their account and currently we aren't able to do that. This includes deleting saved credit card information that is tied to a subscription set to auto renewal. How would that help you?: This would help keep our customers satisfied per their requests and allow us to keep clean records with consistent start and end dates. How important is this to you?: Important Email address: ksouders@wtwhmedia.com ——————————————— This task was submitted through Suggest an idea https://form.asana.com/?k=qsv6hMm2wL8SXD_R-h-N9Q&d=742417627358732