Billing Contact Management
Send invoices to the people who pay, without giving them account access.
What it adds
A list of billing recipients per account who receive invoices and payment notices but hold no login or permissions.
What your agent is told to do
5
What your agent is told to do
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1
Model a billing contact as an email address on the account, not as a user. Adding one must never create a login, a seat, or any read access to the product.
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2
Allow several recipients and let each be added or removed by an account admin, with a record of who changed the list.
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3
Send invoices, receipts and payment-failure notices to every billing contact. Keep owner-critical notices — cancellation, ownership change, security events — going to the account owner regardless of this list.
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Verify a new address before relying on it as the only recipient. Token mechanics are owned by Email Verification; reuse that flow rather than writing a second one.
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Do NOT let this list be emptied. An account with no billing recipient silently stops receiving invoices, and the first anyone hears of it is a failed payment.
Edge cases it handles
6
Edge cases it handles
6- A billing contact who is also a member must not have their product notification preferences changed by being added here.
- Marketing and product email opt-outs must not suppress invoices. Those preferences are owned by the Email Preference Center; transactional billing mail sits outside them.
- A bouncing billing address must be surfaced to an admin rather than retried forever. Bounce detection itself is owned by Notification Delivery Failures; consume its signal.
- Removing a contact stops future delivery only. Invoices already sent stay sent, and past invoices remain visible to admins.
- The same address may be a billing contact on several accounts. Verification and removal must be scoped per account, not globally.
- A departing employee's address often lingers as the only billing contact. Prompt for a replacement when the matching member is removed from the account.
Definition of done
8
Definition of done
8- Adding a billing contact grants no login, seat, or data access.
- An account supports multiple billing contacts and records who added or removed each one.
- Invoices and payment notices reach every verified billing contact.
- Owner-critical notices still reach the account owner independently of this list.
- Marketing opt-out does not suppress billing mail.
- The system prevents an account from being left with no billing recipient, and flags bouncing addresses to an admin.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
Usage Limits
Usage Limits
Cap what free accounts can do — visibly and fairly.
What it does
Per-plan usage limits, enforced server-side, with the user always able to see where they stand.
How it works
- 1 Define limits per plan in one place. Do not scatter magic numbers through the codebase.
- 2 Enforce on the server at the point of creation. A client-side check is decoration.
- 3 Show current usage BEFORE the user hits the wall — surprise limits feel like a bug.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/usage-limits
Upgrade Modal
Upgrade Modal
Sell the upgrade at the exact moment someone wants it.
What it does
A focused upsell that appears when a free user reaches for a paid capability.
How it works
- 1 Trigger it at the point of intent — when they click the locked thing — not on a timer or on page load.
- 2 Name the specific feature they just tried to use. A generic pricing modal converts far worse.
- 3 State the price plainly and give one button to upgrade.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/upgrade-modal
Billing Portal
Billing Portal
Let people manage their own subscription.
What it does
A billing area where users can see their plan, change payment method, get invoices, and cancel.
How it works
- 1 Use the payment provider's hosted billing portal if it has one. Do not rebuild card management — it's a PCI liability you don't need.
- 2 Show the current plan, renewal date, and payment method on your own account page.
- 3 Make cancelling possible without emailing support. Dark patterns here generate chargebacks.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/billing-portal
How it works
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1
Copy the link
Grab the Markdown instruction URL for this feature.
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2
Give it to your AI
Paste it into Claude Code, Cursor, v0, Lovable — whatever you build with.
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3
It inspects, then implements
Your agent reads your existing app first, then adds the feature to fit it.
Works with your stack
These instructions are written to adapt. They tell the agent to detect your framework, match your existing design system, and reuse what you already have — rather than assuming a particular stack.
Need it tighter than that? Customize the feature and tell it exactly what you're running.