# Expense

### Overview

The expense module implements the functionality of bills and payments. A bill or a group of bills can be aggregated together as payments. Payment advice can be submitted through integration with IFMS (Integrated Financial Management Systems) or any other third-party payment provider. The expense module always works in combination with a calculator service. The calculator service is implementation-specific and provides business logic to compute bills. The calculator calls into the expense service to create bills. In general, the expense create/update APIs are not called by any other module other than the calculator. 

[Click here ](https://docs.digit.org/works/reference-implementations/muktasoft-v2.2/deployment/muktasoft-services/expense-calculator)to browse for more information on the sample calculator provided with the Works platform. 

### Pre-requisites

* DIGIT backbone services
* Persister
* Indexer
* IDGen
* MDMS
* Workflow
* Notification

### Functionalities

* Create/update/search functionality for bills
* Ability to create different bill types according to configuration.
* The workflow is integrated and needs to be configured for usage.
* Works with an expense calculator that contains the business logic to compute bills. 

**Code**

[Expense Module](https://github.com/egovernments/DIGIT-Works/tree/master/backend/expense)

### Deployment Details

[Helm Chart](https://github.com/egovernments/DIGIT-DevOps/tree/digit-works/deploy-as-code/helm/charts/digit-works/backend/expense)

### Configuration Details

### Integration Details

[API spec](https://docs.digit.org/works/platform/architecture/low-level-design/services/expense#api-specifications)