Lawmatics Payment Invoices API
The Payment Invoices API from Lawmatics — 2 operation(s) for payment invoices.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Lawmatics OAuth Payment Invoices API
version: 1.22.0
description: The official Lawmatics REST API for legal CRM, client intake and law firm automation.
contact:
name: Lawmatics API Support
email: api@lawmatics.com
url: https://docs.lawmatics.com/
termsOfService: https://www.lawmatics.com/terms-of-use
servers:
- url: https://api.lawmatics.com
description: Lawmatics production API
security:
- oauth2: []
- bearerAuth: []
tags:
- name: Payment Invoices
paths:
/v1/invoices/{invoice_id}:
get:
operationId: getInvoice
summary: Invoice
description: A specific Invoice in Lawmatics
tags:
- Payment Invoices
parameters:
- name: invoice_id
in: path
required: true
description: The invoice id
schema:
type: string
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
examples:
getInvoice:
summary: GET Invoice
value:
data:
id: '1'
type: invoice
attributes:
number: 1
status: sent
target_account_type: operating
payment_terms: due_date
include_balance_forward: false
enable_online_payment: false
include_statement_of_accounts: false
invoiced_at: '2021-11-02'
due_at: '2021-11-02'
voided_at: null
contactable_address: null
contactable_name: Roey Tester
note: "hey zsolt this is a specific invoice note\n\nhere \nis\na \nbunch\n\nof (two)\nnewlines"
amount_cents: 0
amount_paid_cents: 0
outstanding_amount_cents: 0
pdf_url: http://localhost:3000/attachments/80623eb43ae0fa961d5a32b8d169fd54a0249de1/store/511432f743969f1e7b9cc636c1a9c7b4ca1a4d5dd902ef0a1ba405ff89f7/Invoice+%231.pdf
created_at: '2021-11-02T10:28:40.535-07:00'
updated_at: '2022-01-10T19:43:47.382-08:00'
relationships:
invoice_type:
data: null
prospect:
data:
id: '101'
type: prospect
created_by:
data:
id: '5'
type: created_by
forwarded_to:
data: null
time_entries:
data:
- id: '8'
type: time_entry
expenses:
data: []
invoice_adjustments:
data: []
transactions:
data: []
forwarded_from:
data: []
'401':
description: Unauthorized - missing or invalid OAuth 2.0 bearer token
'429':
description: Too Many Requests - the per-firm rate limit was exceeded; a Retry-After header is returned
headers:
Retry-After:
description: Seconds to wait before retrying
schema:
type: integer
/v1/invoices:
get:
operationId: getInvoices
summary: Invoices
description: A paginated list of all Invoices in Lawmatics
tags:
- Payment Invoices
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
examples:
getInvoices:
summary: GET Invoices
value:
data:
- id: '1'
type: invoice
attributes:
number: 1
status: sent
target_account_type: operating
payment_terms: due_date
include_balance_forward: false
enable_online_payment: false
include_statement_of_accounts: false
invoiced_at: '2021-11-02'
due_at: '2021-11-02'
voided_at: null
contactable_address: null
contactable_name: Roey Tester
note: "hey zsolt this is a specific invoice note\n\nhere \nis\na \nbunch\n\nof (two)\nnewlines"
amount_cents: 0
amount_paid_cents: 0
outstanding_amount_cents: 0
pdf_url: http://localhost:3000/attachments/80623eb43ae0fa961d5a32b8d169fd54a0249de1/store/511432f743969f1e7b9cc636c1a9c7b4ca1a4d5dd902ef0a1ba405ff89f7/Invoice+%231.pdf
created_at: '2021-11-02T10:28:40.535-07:00'
updated_at: '2022-01-10T19:43:47.382-08:00'
relationships:
invoice_type:
data: null
prospect:
data:
id: '101'
type: prospect
created_by:
data:
id: '5'
type: created_by
forwarded_to:
data: null
time_entries:
data:
- id: '8'
type: time_entry
expenses:
data: []
invoice_adjustments:
data: []
transactions:
data: []
forwarded_from:
data: []
meta:
total_pages: 1
limit_per_page: 25
total_entries: 1
links:
self: /v1/invoices?page=1
'401':
description: Unauthorized - missing or invalid OAuth 2.0 bearer token
'429':
description: Too Many Requests - the per-firm rate limit was exceeded; a Retry-After header is returned
headers:
Retry-After:
description: Seconds to wait before retrying
schema:
type: integer
components:
securitySchemes:
oauth2:
type: oauth2
description: OAuth 2.0 authorization code grant. Register a developer app at https://app.lawmatics.com/settings/developers (developer settings must be enabled by Lawmatics support). Access tokens are non-expiring; no refresh tokens are issued and scopes are not supported.
flows:
authorizationCode:
authorizationUrl: https://app.lawmatics.com/oauth/authorize
tokenUrl: https://api.lawmatics.com/oauth/token
scopes: {}
bearerAuth:
type: http
scheme: bearer
description: 'The OAuth 2.0 access token is sent as `Authorization: Bearer <access_token>`.'
externalDocs:
description: Official Lawmatics RESTful API documentation (Postman)
url: https://docs.lawmatics.com/
x-provenance:
generated: '2026-08-13'
method: derived
publisher: API Evangelist
source: https://docs.lawmatics.com/api/collections/26379991/2sA3JM7gbw?segregateAuth=true&versionTag=latest
source_type: Postman collection published by Lawmatics as its official API documentation
source_file: postman/lawmatics-oauth-api.postman_collection.json
note: 'NOT published by Lawmatics. Lawmatics publishes no OpenAPI. Every path, method, parameter, request example and response example in this document was converted mechanically from the provider-published Postman collection "Lawmatics OAuth API v1.22.0"; nothing was invented. Schemas are typed as generic objects because the collection carries examples, not JSON Schema. The server URL is the base documented in the collection Param Guide (https://api.lawmatics.com), not the collection''s disabled {{host}} placeholder. The 401 and 429 responses added to every authenticated operation are the provider-documented, globally applicable responses: the collection''s auth guide states a per-firm rate limit applies to all endpoints and returns 429 with a Retry-After header, and https://api.lawmatics.com/v1/contacts was observed returning 401 unauthenticated on 2026-08-13.'