Lawmatics Payment Transactions API
The Payment Transactions API from Lawmatics — 2 operation(s) for payment transactions.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Lawmatics OAuth Payment Transactions API
version: 1.22.0
description: 'The official Lawmatics REST API for legal CRM, client intake and law firm automation. Manage matters (prospects), contacts, companies, custom forms and form entries, custom fields, events and appointments, tasks, notes, files, tags, users, time entries, expenses, invoices and transactions.
Authentication is OAuth 2.0 authorization code grant; access tokens do not expire, there are no refresh tokens, and Lawmatics does not currently support scopes - an authorized app receives full CRUD access to the granted account.
All list endpoints support the shared query-parameter grammar documented in the Param Guide: `fields` (field selection, one level deep, `fields=all` to expand), `page` (pagination), `sort_by`/`sort_order`, and `filter_by`/`filter_on`/`filter_with` (one filter at a time; operators `=`, `!=`, `<=`, `<`, `>=`, `>`, `like`, `ilike`, `null`, `not_null`).
Responses follow a JSON:API-style `data` / `attributes` / `relationships` envelope.'
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 Transactions
paths:
/v1/transactions/{transaction_id}:
get:
operationId: getTransaction
summary: Transaction
description: A specific Transaction in Lawmatics
tags:
- Payment Transactions
parameters:
- name: transaction_id
in: path
required: true
description: The transaction id
schema:
type: string
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
examples:
getTransaction:
summary: GET Transaction
value:
data:
id: '1'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: venmo
transaction_type: credit
amount_cents: 12323
amount_currency: USD
account_id: 101
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: 101
created_at: '2021-12-26T14:52:44.808-08:00'
updated_at: '2021-12-26T14:52:44.808-08:00'
note: Such a goo payment
relationships:
account:
data:
id: '101'
type: contact
prospect:
data:
id: '101'
type: prospect
invoice:
data: null
'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/transactions:
get:
operationId: getTransactions
summary: Transactions
description: A paginated list of all Transactions in Lawmatics
tags:
- Payment Transactions
parameters:
- name: fields
in: query
required: false
schema:
type: string
example: all
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
examples:
getTransactions:
summary: GET Transactions
value:
data:
- id: '6'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: other
transaction_type: credit
amount_cents: 12300
amount_currency: USD
account_id: 3
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: null
created_at: '2022-04-21T00:17:38.437-07:00'
updated_at: '2022-04-21T00:17:38.437-07:00'
note: asdasd
relationships:
account:
data:
id: '3'
type: contact
prospect:
data: null
invoice:
data: null
- id: '5'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: credit_card
transaction_type: credit
amount_cents: 1230
amount_currency: USD
account_id: 3
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: 3
created_at: '2022-04-20T22:37:22.982-07:00'
updated_at: '2022-04-20T22:37:22.982-07:00'
note: asdasdas
relationships:
account:
data:
id: '3'
type: contact
prospect:
data:
id: '3'
type: prospect
invoice:
data: null
- id: '4'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: credit_card
transaction_type: credit
amount_cents: 1230
amount_currency: USD
account_id: 9
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: null
created_at: '2022-04-20T16:47:22.562-07:00'
updated_at: '2022-04-20T16:47:22.562-07:00'
note: asdasdasd
relationships:
account:
data:
id: '9'
type: contact
prospect:
data: null
invoice:
data: null
- id: '3'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: credit_card
transaction_type: credit
amount_cents: 12300
amount_currency: USD
account_id: 3
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: 3
created_at: '2022-04-20T16:47:07.893-07:00'
updated_at: '2022-04-20T16:47:07.893-07:00'
note: test
relationships:
account:
data:
id: '3'
type: contact
prospect:
data:
id: '3'
type: prospect
invoice:
data: null
- id: '2'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: credit_card
transaction_type: credit
amount_cents: 123123
amount_currency: USD
account_id: 101
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: 101
created_at: '2022-01-10T20:05:03.839-08:00'
updated_at: '2022-01-10T20:05:03.839-08:00'
note: Tester
relationships:
account:
data:
id: '101'
type: contact
prospect:
data:
id: '101'
type: prospect
invoice:
data: null
- id: '1'
type: transaction
attributes:
account_type: Contact
bank_account_type: trust
status: processed
payment_method: venmo
transaction_type: credit
amount_cents: 12323
amount_currency: USD
account_id: 101
created_by_id: 5
firm_id: 2
external_id: null
invoice_id: null
prospect_id: 101
created_at: '2021-12-26T14:52:44.808-08:00'
updated_at: '2021-12-26T14:52:44.808-08:00'
note: Such a goo payment
relationships:
account:
data:
id: '101'
type: contact
prospect:
data:
id: '101'
type: prospect
invoice:
data: null
meta:
total_pages: 1
limit_per_page: 25
total_entries: 6
links:
self: /v1/transactions?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
post:
operationId: createTransaction
summary: Create Transaction
description: "Create a new Transaction\n\nOptional Fields: invoice_number, invoice_id, note \n\ninvoice_number or invoice_id: only one should be specified\n\ntransactable: Prospect, Contact, Company with which to associate the transaction\n\ntransaction_type: debit or credit\n\nbank_account_type: operating or trust\n\npayment_method: credit_card, check, cash, paypal, venmo, trust_payment, debit_card, ach, or other"
tags:
- Payment Transactions
parameters:
- name: fields
in: query
required: false
schema:
type: string
example: all
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
examples:
postCreateRefundTransaction:
summary: POST Create Refund Transaction
value:
data:
id: '38'
type: transaction
attributes:
account_type: Contact
bank_account_type: operating
payment_method: invoice_refund
transaction_type: debit
amount_cents: 5000
amount_currency: USD
account_id: 112
external_id: null
created_at: '2022-12-27T13:15:25.890-08:00'
updated_at: '2022-12-27T13:15:25.890-08:00'
note: ''
relationships:
created_by:
data:
id: '5'
type: user
account:
data:
id: '112'
type: contact
prospect:
data:
id: '113'
type: prospect
invoice:
data:
id: '1'
type: invoice
trust_fund_request:
data: null
refunded_transaction:
data:
id: '30'
type: transaction
postCreateTransaction:
summary: POST Create Transaction
value:
data:
id: '36'
type: transaction
attributes:
account_type: Contact
bank_account_type: operating
payment_method: credit_card
transaction_type: credit
amount_cents: 5000
amount_currency: USD
account_id: 112
external_id: null
created_at: '2022-12-27T13:09:52.790-08:00'
updated_at: '2022-12-27T13:09:52.790-08:00'
note: ''
relationships:
created_by:
data:
id: '5'
type: user
account:
data:
id: '112'
type: contact
prospect:
data:
id: '113'
type: prospect
invoice:
data:
id: '1'
type: invoice
trust_fund_request:
data: null
'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.'