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FastBill integration

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Overview

Company website:

https://www.fastbill.com

Integration launch date:

November 2, 2026

API Categories:

Accounting E-Commerce Passthrough

API Authorization:

Email Address / API Key

ACCOUNTING CONTACT

End-API object:

customer

Unified API Methods:

List Get Create Update Remove

List options:

limit offset query

Readable fields:

billing_address company_name created_at currency emails first_name id identification is_customer is_supplier last_name name payment_methods payment_terms portal_url tax_number telephones updated_at website

Writable fields:

billing_address company_name currency emails first_name identification last_name name tax_number telephones website

ACCOUNTING INVOICE

End-API object:

invoice

Unified API Methods:

List Get Create Update Remove

List options:

contact_id end_lt limit offset start_gte

Writable fields:

contact_id currency is_inclusive_of_tax lineitems posted_at project_id reference

ACCOUNTING QUOTE

End-API object:

estimate

Unified API Methods:

List Get Create Remove

List options:

contact_id end_lt limit offset start_gte

Readable fields:

contact_id currency currency_rate customer_message discount_amount expires_at id issued_at lineitems project_id quote_number status sub_total_amount tax_amount tax_mode title total_amount url

Writable fields:

contact_id lineitems issued_at tax_mode

required fields

ACCOUNTING BILL

End-API object:

expense

Unified API Methods:

List options:

end_lt limit offset start_gte

Readable fields:

bill_number currency due_at exchange_rate extended_notes id lineitems notes paid_at posted_at project_id status sub_total_amount tax_amount total_amount url

Writable fields:

ACCOUNTING SALESRECEIPT

End-API object:

revenue

Unified API Methods:

List options:

contact_id end_lt limit offset start_gte

Readable fields:

billing_address contact_id currency exchange_rate id is_inclusive_of_tax lineitems notes posted_at project_id receipt_number reference status sub_total_amount tax_amount total_amount updated_at

Writable fields:

ACCOUNTING PROJECT

End-API object:

project

Unified API Methods:

List Get Create Update Remove

List options:

contact_id limit offset

Readable fields:

code contact_id currency due_at id name started_at

Writable fields:

contact_id currency due_at name started_at

COMMERCE ITEM

End-API object:

article

Unified API Methods:

List Get Create Update Remove

List options:

Readable fields:

description global_code id name prices tags type

Writable fields:

description global_code name prices tags type

PASSTHROUGH

Unified API Methods:

POST GET PUT DELETE

List options:

Readable fields:

Writable fields:

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