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Blnk Finance

The developer-first toolkit for building compliant financial products.

A complete backend toolkit to build accurate and compliant financial products.

Blnk Developer Documentation • Open-source Backend for Financial Products

Start here

Getting Started with Blnk

Learn how to create and use ledgers in Blnk.

About Ledgers • Blnk Developer Documentation

Overview

Learn how to use the General Ledger to organize the flow of funds in your application.

Learn how to use a General Ledger to organize the flow of funds in your application.

General Ledger • Blnk Developer Documentation

General ledger

General Ledger

An introduction to designing the flow of funds in your organization.

Learn how to represent the flow of funds within your fintech application.

Money Movement Maps • Blnk Developer Documentation

Money movement map

Money Movement Map

Learn how to set up your ledgers for easy navigation & reference.

Ledger Architecture • Blnk Developer Documentation

Ledger architecture

Architecting your ledger

Learn how to create and use balances in Blnk.

About Balances • Blnk Developer Documentation

Learn how to set your asset classes (currencies).

Learn how to represent currencies, crypto, and custom classes in your Ledger.

Defining Asset Classes • Blnk Developer Documentation

Asset classes

Defining asset classes

Learn how to create and use internal balances for your organization.

Learn how to create and use internal balances in your Blnk Ledger

Internal Balances • Blnk Developer Documentation

Internal balances

Monitor balances and get notified via webhook when they meet set conditions.

Balance Monitoring • Blnk Developer Documentation

Balance monitoring

Learn how to correct errors to esnure accuracy in your Blnk Ledger.

Learn how to correct errors and ensure accuracy in your ledger balances.

Adjusting Balances • Blnk Developer Documentation

Adjusting balances

Learn how to close and zero out balances in your Ledger

Closing Balances • Blnk Developer Documentation

Closing balances

Capture and manage periodical balance snapshots for accurate financial reporting.

Balance Snapshots • Blnk Developer Documentation

Balance snapshots

Balance Snapshots

Retrieve accurate historical balance information.

Retrieve accurate historical balance information

Historical Balances • Blnk Developer Documentation

Historical balances

Retrieving Historical Balances

Learn how transactions are recorded and processed in Blnk

Learn how to record and track transactions in Blnk.

About Transactions • Blnk Developer Documentation

About Transactions

Learn about the different statuses of a transaction.

Learn about the different statuses in the Blnk Ledger

Transaction Statuses • Blnk Developer Documentation

Statuses

Transaction statuses

Ensure correctness when recording amounts with floating points in your Blnk Ledger

Learn how to ensure correctness when recording amounts with floating points in your Blnk Ledger

Transaction Precision • Blnk Developer Documentation

Precision

Transaction precision

Represent balance overdrafts and negative balances in your Ledger.

Learn how to represent overdrafts and negative balances in your Ledger.

Applying Overdrafts  • Blnk Developer Documentation

Overdrafts

Applying overdrafts

Learn how to hold transactions until a condition is met.

Hold transaction until a condition is met with Blnk inflight transactions

Inflight Transactions • Blnk Developer Documentation

Inflight

Applying inflight

Learn how to manage refunds in your Blnk Ledger

Refunding Transactions • Blnk Developer Documentation

Refunds

Refunding transactions

Learn how to schedule a transaction for a later date in your Blnk Ledger.

Schedule transactions for a later date in your Blnk Ledger.

Scheduling Transactions • Blnk Developer Documentation

Scheduling transactions

Move money from multiple sources to a single destination.

Multiple Sources • Blnk Developer Documentation

Multiple sources

Move money from a single source to multiple destinations.

Move money from a single source to a multiple destinations in your Blnk Ledger.

Multiple Destinations  • Blnk Developer Documentation

Multiple destinations

Learn how to handle bulk transactions in Blnk

Learn how to handle bulk transactions in Blnk.

Bulk Transactions • Blnk Developer Documentation

Bulk transactions

Bulk Transactions

Learn how to log past transactions in your ledger

Backdated Transactions • Blnk Developer Documentation

Backdated transactions

Backdated Transactions

Learn how Blnk uses transaction hashing for immutability.

Blnk uses SHA-256 hashing to ensure transaction integrity and security in your application.

Transaction Hashing • Blnk Developer Documentation

Transaction hashing

Learn how to set up reconciliation workflows for your Blnk Ledger.

About Reconciliation • Blnk Developer Documentation

Learn how to prepare your external records for reconciliation.

Learn how to prepare and upload your external records for reconciliation.

External Data Preparation • Blnk Developer Documentation

External data

External Data Preparation

Determine how Blnk compares and matches records between your Ledger and external data.

Set rules that govern how your Ledger and external records are matched

Matching Rules • Blnk Developer Documentation

Matching rules

Choose the strategy that best fits your financial workflows.

Choose and apply the strategy that best fits your financial workflows.

Reconciliation Strategies • Blnk Developer Documentation

Reconciliation strategies

Hands-on tutorial on performing reconciliation with Blnk Core.

Reconciliation Practice Example • Blnk Developer Documentation

Practice example

Practice Example

Identity Overview • Blnk Developer Documentation

Learn how to link identities to a balance

Learn how to link identities to balances.

Connect Identity to Balance • Blnk Developer Documentation

Link balances

Link identity to a balance

Learn how to secure sensitive customer data using PII tokenization.

PII Tokenisation in Blnk • Blnk Developer Documentation

PII tokenization

PII Tokenisation in Blnk

About Metadata • Blnk Developer Documentation

Introduction to Metadata

Learn how to add metadata information to an entity in Blnk.

Create Metadata • Blnk Developer Documentation

Create Metadata

Learn how to modify or add new metadata to a ledger component.

Update Metadata • Blnk Developer Documentation

Update Metadata

Introduction to Hooks • Blnk Developer Documentation

Introduction to Hooks

Manage hooks

Create, Edit, and Manage Hooks

Explore examples of how Hooks can be used in Blnk.

Examples

Practical Applications of Hooks

Learn how to retrieve any data in your Ledger.

About Search • Blnk Developer Documentation

Getting started with Search

Learn how to use the query field in Search.

Querying • Blnk Developer Documentation

Querying parameters

Learn how to use filters to streamline your search results.

Use filters to streamline your search results

Filtering • Blnk Developer Documentation

Filtering parameters

Learn how to use sorting to order your search results.

Order your search results by creation date, scheduled date, or combine for multi-step sorting.

Sorting • Blnk Developer Documentation

Sorting parameters

Learn how to use pagination to manage large sets of search results.

Pagination • Blnk Developer Documentation

Pagination parameters

An engineer's guide to the Double Entry principle with Blnk.

Learn the basics, explore scenarios, and simplify record-keeping in your Blnk Ledger.

Double-Entry Principle in the Blnk Ledger • Blnk Developer Documentation

Double-entry principle

Understanding the double-entry principle

Learn what negative balances and how to work with them in your Ledger.

Learn what negative balances are and how to work with them in the Blnk Ledger.

Handling Negative Balances • Blnk Developer Documentation

Negative balances

How negative balances work in Blnk

Learn how and why Blnk queues transactions.

Learn how Blnk handles concurrency with queues and optimistic locking.

How We Manage Concurrency • Blnk Developer Documentation

Handling concurrency

View the list of all countries and their corresponding ISO currency code.

Currencies • Blnk Developer Documentation

Currencies

List of countries and their currency code

Learn how to migrate financial data from external systems to your Blnk Ledger.

Data Migration • Blnk Developer Documentation

Data migration

How to Migrate Data to your Blnk Ledger

Reconstruct and correct discrepancies in your ledger balances.

Reconstruct and correct discrepancies in your ledger balances

Balance Reconstruction • Blnk Developer Documentation

Balance reconstruction

Balance Reconstruction

Configure real-time alerts for transaction events and handle error notifications through Slack. Stay updated with critical information.

Configure real-time alerts for transaction events and handle error notifications through Slack.

Quick Start

Digital Banking

Cryptocurrency

Card payments