Features
Give your own software secure, scoped access to one business. Read customers, items, vendors, projects, taxes and documents over a clean REST API, and create customers, items, draft invoices and estimates, draft bills and purchase orders, expenses and time entries with exactly the access you grant. Sending and payments stay in your hands.
How it works
Create a key on the Integrations page, choose its business and what it can do, and share it with your developer. You stay in control and can revoke any key at any time.
Created by the owner, confirmed with your password
Name the key, choose its business and what it can do, then confirm with your password, plus your authenticator code when two-factor sign-in is on. The key is shown once, so store it somewhere safe, such as a password manager. Copy Setup Prompt hands your AI coding tool the address and key in one paste.
A Read Only key reads customers, items, vendors, projects and documents. Read and Create Records adds exactly the records you tick: Customers and Items, Draft Invoices and Estimates, Draft Bills and Purchase Orders, Expenses, and Time Entries. Need broader access later? Create a new key with the scope you want.
Same rules as the app
Read the business's details, customers, items, vendors, projects, taxes and expense categories, and list or open invoices, estimates, bills and purchase orders. Results arrive as paged JSON, 25 rows at a time, and every key is scoped to its own business.
New records pass the same checks as Invoice Crowd's own forms. Invoices, estimates, bills and purchase orders arrive as drafts, ready for you to review and send. Expenses post to your books just like the Add Expense form, and time entries are logged on an existing project. Each record is saved the moment the request succeeds.
Reference, retries and usage
The API Reference, opened from the Integrations page, gives your developer the base URL, authentication and a quick start, plus an OpenAPI file for their tools. Errors return JSON with a stable code and a plain-language message that explains the next step.
Every create carries an Idempotency-Key, so a retried request returns the original result instead of a duplicate. All your keys share one monthly request allowance, shown as Requests This Month on the Integrations page, and every response reports the requests remaining and the reset date.
Built in
Sync records from your own software with confidence. Sending documents and collecting payments stay in Invoice Crowd, under your control.
Read your customers and items, and create new ones from a CRM, a form or a product catalog.
Create drafts with lines priced by Invoice Crowd, ready for you to review and send from the app.
Create vendor bills and purchase orders as drafts from your purchasing or inventory software.
Record expenses with their category and payment account, posted to your books like the Add Expense form.
Log time on an existing project from your own time tracker.
Sending documents, recording payments and changing or deleting existing records stay in Invoice Crowd, with you.
Only the account owner can create, renew and revoke keys.
The Developer API is included on paid monthly and yearly plans.
Questions
Yes. The Developer API gives your own software secure access to one business with an API key. It reads your data and creates the records you allow: customers, items, draft invoices and estimates, draft bills and purchase orders, expenses and time entries. Keys are created on the Integrations page.
Only you send documents to customers. Invoices and estimates created through the API arrive as drafts that you review and send from Invoice Crowd, and payments, deletions and edits to existing records stay in the app.
Paid plans billed monthly or yearly include the Developer API. Your monthly request allowance appears on the Integrations page as Requests This Month.
Each key lasts 90 days, and you can renew it from its menu for another 90 days with the same access. Revoking a key or changing your Invoice Crowd password ends it at once, and you can hold up to five keys.
Nothing is duplicated. Every create carries an Idempotency-Key header, so sending the same key and body again returns the original result instead of creating a second record. Reusing a key with a different body is rejected.
Zapier and Pabbly Connect connect Invoice Crowd to other apps without code. AI Connections let Claude or ChatGPT prepare changes that you approve. The Developer API is for your own software, with a key you control and records saved straight away within the access you chose.
Yes, with webhooks. On the Integrations page, add a webhook URL and choose events such as Invoice Updated, Customer Created or Expense Created, and Invoice Crowd posts signed JSON to your HTTPS address each time one happens. The API reads and creates records when your software asks; webhooks tell your software the moment something changes.
Create an API key on the Integrations page, choose its business and access, and share the API Reference with your developer.
