Chase overdue invoices: reminder 1, reminder 2, final notice, escalation dates, aging.
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The aging summary across every unpaid invoice: current, 1-30, 31-60, 61-90 and 91+ day buckets, with counts and totals in integer cents, per currency. This is the answer to "how much am I owed, and how stale is it".
The date to age against, YYYY-MM-DD. Default today
The aging summary across every unpaid invoice: current, 1-30, 31-60, 61-90 and 91+ day buckets, with counts and totals in integer cents, per currency. This is the answer to "how much am I owed, and how stale is it".
| Argument | Type | Description |
|---|---|---|
| on | string | The date to age against, YYYY-MM-DD. Default today |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"on": {
"type": "string",
"maxLength": 10,
"description": "The date to age against, YYYY-MM-DD. Default today"
}
},
"additionalProperties": false
}The day's chase list: which invoices cross an escalation threshold today, which letter to send each and how long it has been waiting, what falls due in the next few days, and which invoices have had all three letters and need a decision outside this server.
| Argument | Type | Description |
|---|---|---|
| on | string | The date to run the list for, YYYY-MM-DD, e.g. to see what Monday will need. Default today |
| within_days | integer | How far ahead to list letters coming due, default 7 days |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"on": {
"type": "string",
"maxLength": 10,
"description": "The date to run the list for, YYYY-MM-DD, e.g. to see what Monday will need. Default today"
},
"within_days": {
"type": "integer",
"maximum": 90,
"minimum": 0,
"description": "How far ahead to list letters coming due, default 7 days"
}
},
"additionalProperties": false
}Delete an invoice entered wrongly, by id or reference: the record, its payments and its letter history. The id is not reissued, so a gap in the DUN series is the record that a deletion happened.
| Argument | Type | Description |
|---|---|---|
| invoice* | string | The chased invoice: its id (DUN-2026-0001) or its invoice reference |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"invoice"
],
"properties": {
"invoice": {
"type": "string",
"maxLength": 200,
"description": "The chased invoice: its id (DUN-2026-0001) or its invoice reference"
}
},
"additionalProperties": false
}Start chasing an unpaid invoice: register the client, the invoice reference, the amount in integer cents, the currency and the due date, and get the three-letter escalation schedule (reminder 1, reminder 2, final notice) with the date each falls due. Free tier: 3 unpaid invoices chased at once.
| Argument | Type | Description |
|---|---|---|
| due* | string | The date payment fell due, YYYY-MM-DD. The ladder is anchored to this date |
| gaps | array | Days after the due date at which reminder 1, reminder 2 and the final notice fall due, strictly increasing. Default [7, 14, 21] |
| note | string | |
| client* | string | Who owes the money, e.g. Acme Ltd |
| issued | string | The date the invoice was issued, YYYY-MM-DD, for the letter's reference line |
| currency* | string | ISO code the invoice was issued in |
| reference* | string | The invoice number being chased, e.g. INV-1042 |
| amount_minor* | integer | The invoice amount in whole minor units (integer cents). 125000 is USD 1,250.00 |
One chased invoice in full: what was billed, what has been paid and what is still owed, every letter sent with its date, the escalation schedule with each stage's state, and what happens next and when.
| Argument | Type | Description |
|---|---|---|
| on | string | The date to judge lateness against, YYYY-MM-DD. Default today |
| invoice* | string | The chased invoice: its id (DUN-2026-0001) or its invoice reference |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"invoice"
],
"properties": {
"on": {
"type": "string",
"maxLength": 10,
"description": "The date to judge lateness against, YYYY-MM-DD. Default today"
},
"invoice": {
"type": "string",
"maxLength": 200,
"description": "The chased invoice: its id (DUN-2026-0001) or its invoice reference"
}
},
"additionalProperties": false
}Chase an unpaid invoice: generate the letter for the current stage of the ladder -- reminder 1 (polite), reminder 2 (firm, with the late fees note) or the final notice (before-action wording) -- as Markdown or as self-contained printable HTML. Nothing is emailed or sent anywhere: this server produces the letter text, and sending it is your act. Record the sending with letter_sent so the ladder advances.
| Argument | Type | Description |
|---|---|---|
| on | string | The letter's date, YYYY-MM-DD; late fees accrue to it and the final-notice deadline is 7 days after it. Default today |
| stage | number | Render a specific stage instead of the one currently due, to preview or to re-issue a letter already sent |
| format | string | markdown (default) or html: a self-contained printable page with no external anything |
| invoice* | string | The chased invoice: its id (DUN-2026-0001) or its invoice reference |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"invoice"
],
"properties": {
"on": {
"type": "string",
"maxLength": 10,
"description": "The letter's date, YYYY-MM-DD; late fees accrue to it and the final-notice deadline is 7 days after it. Default today"
},
"stage": {
"enum": [
1,
2,
3
],
"type": "number",
"description": "Render a specific stage instead of the one currently due, to preview or to re-issue a letter already sent"
},
"format": {
"enum": [
"markdown",
"html"
],
"type": "string",
"description": "markdown (default) or html: a self-contained printable page with no external anything"
},
"invoice": {
"type": "string",
"maxLength": 200,
"description": "The chased invoice: its id (DUN-2026-0001) or its invoice reference"
}
},
"additionalProperties": false
}Record that a chase letter was actually sent, with its date, so the ladder advances to the next stage. Letters go out in order: reminder 2 cannot be recorded before reminder 1. Returns what is due next and when.
| Argument | Type | Description |
|---|---|---|
| sent | string | The date it was sent, YYYY-MM-DD. Default today |
| stage | number | Which letter went out. Default the lowest unsent stage |
| invoice* | string | The chased invoice: its id (DUN-2026-0001) or its invoice reference |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"invoice"
],
"properties": {
"sent": {
"type": "string",
"maxLength": 10,
"description": "The date it was sent, YYYY-MM-DD. Default today"
},
"stage": {
"enum": [
1,
2,
3
],
"type": "number",
"description": "Which letter went out. Default the lowest unsent stage"
},
"invoice": {
"type": "string",
"maxLength": 200,
"description": "The chased invoice: its id (DUN-2026-0001) or its invoice reference"
}
},
"additionalProperties": false
}Turn Pro on for this connection with key, an MCPL1.<payload>.<signature> issued at checkout for this server or the bundle. Data under your token stays; a wrong or expired key changes nothing. license_status confirms it.
| Argument | Type | Description |
|---|---|---|
| key* | string | License key from checkout, MCPL1.<payload>.<signature> |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"key"
],
"properties": {
"key": {
"type": "string",
"description": "License key from checkout, MCPL1.<payload>.<signature>"
}
},
"additionalProperties": false
}Report this endpoint's licence state for your token as JSON: the product, the tier free or pro, why it is not Pro, and the checkout URL. Call it to explain a free-tier refusal. No arguments, nothing changes.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}Every unpaid invoice past its due date: how many days late, what is still owed, which letters have gone out, and what is due next and when. Sorted by days late, worst first.
| Argument | Type | Description |
|---|---|---|
| on | string | The date to judge lateness against, YYYY-MM-DD. Default today |
| limit | integer | Maximum rows, default and ceiling 2000 |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"on": {
"type": "string",
"maxLength": 10,
"description": "The date to judge lateness against, YYYY-MM-DD. Default today"
},
"limit": {
"type": "integer",
"maximum": 2000,
"minimum": 1,
"description": "Maximum rows, default and ceiling 2000"
}
},
"additionalProperties": false
}Record money received against a chased invoice, in whole MINOR units: a part payment lowers what is still chased, a payment that covers the balance closes the ladder and frees the free-tier slot. Returns the outstanding amount.
| Argument | Type | Description |
|---|---|---|
| date | string | The date the money arrived, YYYY-MM-DD. Default today |
| note | string | How it was paid, e.g. Bank transfer, or what it was against |
| invoice* | string | The chased invoice: its id (DUN-2026-0001) or its invoice reference |
| amount_minor* | integer | What was received, in whole minor units |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"invoice",
"amount_minor"
],
"properties": {
"date": {
"type": "string",
"maxLength": 10,
"description": "The date the money arrived, YYYY-MM-DD. Default today"
},
"note": {
"type": "string",
"maxLength": 2000,
"description": "How it was paid, e.g. Bank transfer, or what it was against"
},
"invoice": {
"type": "string",
"maxLength": 200,
"description": "The chased invoice: its id (DUN-2026-0001) or its invoice reference"
},
"amount_minor": {
"type": "integer",
"maximum": 100000000000000,
"minimum": 1,
"description": "What was received, in whole minor units"
}
},
"additionalProperties": false
}| duplicate_ok | boolean | Register even though an identical invoice is already on the register. Default false |
| late_fee_percent_per_month | number | Late payment interest your terms allow, percent per month, simple and pro-rata. When set, reminder 2 and the final notice state the accrued figure |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"client",
"reference",
"amount_minor",
"currency",
"due"
],
"properties": {
"due": {
"type": "string",
"maxLength": 10,
"description": "The date payment fell due, YYYY-MM-DD. The ladder is anchored to this date"
},
"gaps": {
"type": "array",
"items": {
"type": "integer",
"maximum": 365,
"minimum": 1
},
"maxItems": 3,
"minItems": 3,
"description": "Days after the due date at which reminder 1, reminder 2 and the final notice fall due, strictly increasing. Default [7, 14, 21]"
},
"note": {
"type": "string",
"maxLength": 2000
},
"client": {
"type": "string",
"maxLength": 200,
"description": "Who owes the money, e.g. Acme Ltd"
},
"issued": {
"type": "string",
"maxLength": 10,
"description": "The date the invoice was issued, YYYY-MM-DD, for the letter's reference line"
},
"currency": {
"type": "string",
"pattern": "^[A-Za-z]{3}$",
"description": "ISO code the invoice was issued in"
},
"reference": {
"type": "string",
"maxLength": 200,
"description": "The invoice number being chased, e.g. INV-1042"
},
"amount_minor": {
"type": "integer",
"maximum": 100000000000000,
"minimum": 1,
"description": "The invoice amount in whole minor units (integer cents). 125000 is USD 1,250.00"
},
"duplicate_ok": {
"type": "boolean",
"description": "Register even though an identical invoice is already on the register. Default false"
},
"late_fee_percent_per_month": {
"type": "number",
"maximum": 100,
"description": "Late payment interest your terms allow, percent per month, simple and pro-rata. When set, reminder 2 and the final notice state the accrued figure",
"exclusiveMinimum": 0
}
},
"additionalProperties": false
}