PRODUCT CONCEPT / PROTOTYPE
Billing Software
A prototype billing concept for customer accounts, invoices, line items, payment status, and operator review.
SYSTEM QUESTION
Make the invoice lifecycle visible from draft through approval, delivery, and reconciliation.
Billing state can become ambiguous when invoices, adjustments, and payment events are stored separately.
DIRECT ANSWER
What does Billing Software do?
A prototype billing concept for customer accounts, invoices, line items, payment status, and operator review. It addresses billing state can become ambiguous when invoices, adjustments, and payment events are stored separately.
ROLE & SCOPE
A product concept record; no payment processing, revenue result, or customer account is claimed.
The concept covers invoice drafts, line items, approval, delivery events, and payment status.
CONSTRAINTS
No payment provider, tax calculation, refund policy, or financial outcome is claimed.
ARCHITECTURE
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Invoice lifecycle
moves a bill through draft, approval, delivery, and reconciliation states
content/projects.json
TRUST BOUNDARIES
Invoice to payment event
External payment signals are recorded separately from operator-issued invoice state.
content/projects.json
SECURITY DECISIONS
A payment event being accepted without verification.
Validate provider signatures and keep an auditable event ledger.
content/projects.jsonIMPLEMENTATION EVIDENCE
content/projects.jsonConcept record
The product concept is documented in the curated project registry.
VERIFIED OUTCOMES
The concept makes invoice state transitions explicit.
content/projects.json
OPEN HARDENING
Define idempotency, tax rules, webhook verification, and reconciliation before production use.
content/projects.json