---
title: "Calculate Invoice Payment"
method: POST
path: "/coa/api/v1/invoice/{invoice_id}/calculate-payment"
tags: ["Accounts Receivable"]
---

# Calculate Invoice Payment

`POST /coa/api/v1/invoice/{invoice_id}/calculate-payment`

Calculate the payment details for an invoice.

        This endpoint calculates:
        - Total amount due on the invoice
        - Applied payments (existing + proposed)
        - Applied credits (existing + proposed credit memos)
        - Payment term discounts (based on payment dates) - ALL OR NOTHING: discount only applies if paying full invoice
        - Remaining balance due

        Supports payment terms with early payment discounts (all-or-nothing).

## Path parameters

- `invoice_id` integer, required

## Request body

- CalculatePaymentInput
  - `transactions` TransactionPaymentInput[]
    - `transaction_id` integer, required
    - `amount` number, double, required
    - `posted_at` string, date, required — Payment date for term discount calculation
    - `withholding_amount` number, double, nullable
  - `credit_memos` CreditMemoPaymentInput[]
    - `credit_memo_id` integer, required
    - `amount` number, double, required
    - `posted_at` string, date, required — Application date
  - `empty_transactions` EmptyTransactionInput[]
    - `amount` number, double, required
    - `payment_date` string, date, required — Payment date for term discount calculation
    - `withholding_amount` number, double, nullable

## Response `200`

- CalculatePaymentOutput
  - `total_due` number, double, required
  - `applied_payments` number, double, required
  - `applied_credits` number, double, required
  - `applied_withholding` number, double, required
  - `term_discounts` number, double, required
  - `remaining_due` number, double, required

## Other responses

- `400`
- `404`

---

[API](https://skmtc.net/campfire/apis/campfire-developer-apis.md) · [All operations](https://skmtc.net/campfire/apis/campfire-developer-apis/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/campfire/campfire-developer-apis/revisions/6945ebc3180e/schema)