Set invoice contact ID

Updates the contact ID for an existing invoice. The contact must be a valid organization member from the invoice’s project customer organization.

What happens when you set an invoice contact:

1. The invoice’s contactId field is updated
2. The contact must belong to the project’s customer organization
3. If contactId is set to null, the contact is cleared
4. The contact will receive the invoice when it is sent via email

Important restrictions:

• The contact must be a valid organization member from the project’s customer organization
• Use GET /billing/invoices/invoiceContacts/{projectId} to get available contacts
• The contact must have a valid email address to receive invoices

Use cases:

• Set or change the invoice recipient before sending
• Clear the contact if needed
• Update contact after invoice creation

What is returned:

• Success response confirming the contact was set

curl -X POST "https://leadtime.app/api/public/billing/invoices/setInvoiceContactId" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
  "contactId": "123e4567-e89b-12d3-a456-426614174000",
  "id": "123e4567-e89b-12d3-a456-426614174000"
}'

const response = await fetch("https://leadtime.app/api/public/billing/invoices/setInvoiceContactId", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_ACCESS_TOKEN",
    "Content-Type": "application/json"
  },
  body: "{\n  \"contactId\": \"123e4567-e89b-12d3-a456-426614174000\",\n  \"id\": \"123e4567-e89b-12d3-a456-426614174000\"\n}"
});

import requests

response = requests.post(
    "https://leadtime.app/api/public/billing/invoices/setInvoiceContactId",
    headers={
        "Authorization": "Bearer YOUR_ACCESS_TOKEN",
        "Content-Type": "application/json"
    },
    data="{\n  \"contactId\": \"123e4567-e89b-12d3-a456-426614174000\",\n  \"id\": \"123e4567-e89b-12d3-a456-426614174000\"\n}",
)

{
  "success": true
}