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The inputs this calculator takes (with units, ranges and defaults), the outputs it returns, and the assumptions and tables behind it.

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Run the Late payment interest calculator calculator: Statutory interest rate (base rate plus 8%); Interest per day (£); Statutory interest to date (£); Fixed compensation, section 5A (£). Missing inputs fall back to their documented defaults.

{
  "type": "object",
  "properties": {
    "debt": {
      "type": "number",
      "minimum": 0,
      "maximum": 10000000,
      "description": "Invoice amount still unpaid",
      "default": 10000
    },
    "days": {
      "type": "number",
      "minimum": 0,
      "maximum": 3650,
      "description": "Days the payment has been late",
      "default": 60
    },
    "baseRate": {
      "type": "number",
      "minimum": 0,
      "maximum": 20,
      "description": "Bank of England base rate",
      "default": 3.75
    },
    "purchaser": {
      "type": "string",
      "description": "Who owes you the money",
      "default": "business"
    },
    "extraCosts": {
      "type": "number",
      "minimum": 0,
      "maximum": 100000,
      "description": "Reasonable recovery costs above the fixed sum",
      "default": 0
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Read first. States plainly what submit_enquiry does on Late Payment Interest: it starts an enquiry with human providers who quote directly. Nothing is bought, ordered or paid; no quote is guaranteed; it is free. Also returns who receives the details, the consent wording, and how the person confirms.

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Every field of the Late Payment Interest enquiry: key, label, type, whether required, help text and the allowed options where there are any. Pass answers to submit_enquiry keyed by field key.

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Submits an enquiry to Late Payment Interest — NOT a purchase, NOT a guaranteed quote. Step 1: call with the answers (keyed by field key from enquiry_fields) and consent=true; it validates and returns a summary, the consent line and a confirmation token — show the person the summary and the consent line. Step 2: only if the person agrees, call again with the same answers, consent=true and the confirmation token; the enquiry is then submitted, and the person receives an email with a link they must click before any provider sees it. Consent means the person has read and agreed to: "Happy for my details to go to a relevant debt recovery specialist or solicitor, who'll contact me directly."

{
  "type": "object",
  "properties": {
    "answers": {
      "type": "object",
      "additionalProperties": {
        "type": [
          "string",
          "number",
          "boolean"
        ]
      },
      "description": "the person's answers, keyed by field key"
    },
    "consent": {
      "type": "boolean",
      "description": "true only when the person has agreed to: Happy for my details to go to a relevant debt recovery specialist or solicitor, who'll contact me directly."
    },
    "confirmation": {
      "type": "string",
      "description": "the confirmation token from step 1, after the person has approved the summary"
    }
  },
  "required": [
    "answers",
    "consent"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}