Features
Give your own software an API key for one business. It can read customers, items, vendors, projects, taxes and documents, and, if you allow it, create customers, items, draft invoices, estimates, bills and purchase orders, expenses and time entries. It never sends, records payments, deletes or changes anything that already exists.
How it works
Create a key on the Integrations page, choose its business and what it may do, and hand it to your developer. The key works until it expires, you revoke it or you change your password.
Owner only, confirmed with your password
Create API Key asks for a Key Name, one Business and What the Key Can Do, then your password, plus your authenticator code when two-factor sign-in is on. The key is shown once, so save it somewhere safe such as a password manager. Copy Setup Prompt gives your AI coding tool the address and key in one paste.
A Read Only key can read customers, items, vendors, projects and documents and cannot change anything. Read and Create Records adds the records you tick: Customers and Items, Draft Invoices and Estimates, Draft Bills and Purchase Orders, Expenses, and Time Entries. Access cannot be added to a key later, so create a new key when you need more.
Same rules as the app
Your software can read the business's details, customers, items, vendors, projects, taxes and expense categories, and list or open invoices, estimates, bills and purchase orders. Lists return up to 25 rows at a time, and a key never sees another business.
New records go through the same checks as Invoice Crowd's own forms. Invoices, estimates, bills and purchase orders are saved as drafts and nothing is sent. Expenses are recorded in your books like the Add Expense form, and time entries are logged on an existing project. New records are saved straight away, without a review.
Reference, retries and usage
The API Reference page, opened from the Integrations page, gives your developer the base URL, authentication and a quick start, with an OpenAPI File for their tools. Errors come back as JSON with a stable code and a plain message that says what to do next.
Every create carries an Idempotency-Key, so a retried request returns the first result instead of creating a second record. All your keys share one monthly request allowance, shown as Requests This Month on the Integrations page, and API responses carry the requests remaining and the date the count resets.
Built in
The API is built for syncing and creating records from your own software. Everything that reaches your customer or moves money stays in Invoice Crowd.
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.
The API cannot send documents, record payments, delete records or change anything that already exists.
Only the account owner can create, renew and revoke keys. Team members cannot.
The Developer API is available on paid monthly and yearly plans that include it, not on the Free plan, during a trial or on lifetime plans.
Questions
Yes. The Developer API lets your own software read one business with an API key, and create 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.
No. The API never sends, records payments, deletes or changes anything that already exists. Invoices and estimates are created as drafts that you review and send from Invoice Crowd.
Paid plans billed monthly or yearly that include the API. It is not available on the Free plan, during the free trial or on lifetime plans. Your monthly request allowance is shown on the Integrations page as Requests This Month.
90 days, and you can renew it from its menu for another 90 days with the same access. A key also stops working when you revoke it or change your Invoice Crowd password. You can have up to five keys.
Every create needs an Idempotency-Key header. Sending the same key and body again returns the stored result instead of creating a second record, and the same key with a different body is refused.
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.
Create an API key on the Integrations page, choose its business and what it may create, and share the API Reference with your developer.
