> For the complete documentation index, see [llms.txt](https://docs.digit.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.digit.org/mgramseva/introducing-mgramseva/product-docs/functional-docs/advance-changes.md).

# Advance Changes

## **Overview** <a href="#overview" id="overview"></a>

Water Connection advance changes are added to allow the customer to pay the advance amount. This amount is adjusted when a new demand is generated. We can enable or disable advance based on the configuration.

## Pre-requisites <a href="#pre-requisites" id="pre-requisites"></a>

Before you proceed with the documentation, make sure the following pre-requisites are met -

* *Java 8*
* Kafka server is up and running
* egov-persister service is running and has the water service persister configs path added to it
* PSQL server is running and a database is created to store water connection/application data
* The following services should be up and running:
  * egov-persister
  * egov-mdms
  * ws-services
  * billing-service
  * ws-calculator
  * egov-apportion-service

## Key Functionalities <a href="#key-functionalities" id="key-functionalities"></a>

* Accepts advance amount during water connection creation and while collecting payment
* Creates demand for consumer type waterConnection-advance
* Adjusts the new demand with existing advance with apportion service

## Deployment Details <a href="#deployment-details" id="deployment-details"></a>

Deploy the latest version of ws-service, ws-calculator, billing-service, egov-apportion-service

### MDMS Configuration <a href="#mdms-configuration" id="mdms-configuration"></a>

**Billing Service tax head configuration**

{% code lineNumbers="true" %}

```
{
      "businessService": "ws-services-calculation",
      "code": "WS",
      "collectionModesNotAllowed": [
        "DD",
        "CHEQUE",
        "CARD",
        "OFFLINE_NEFT",
        "OFFLINE_RTGS",
        "POSTAL_ORDER",
        "ONLINE"
      ],
      "partPaymentAllowed": true,
      "isAdvanceAllowed": true,
      "demandUpdateTime": 86400000,
      "isVoucherCreationEnabled": false,
      "billGineiURL" : "egov-searcher/bill-genie/waterbills/_get",
      "isBillAmendmentEnabled":true
    }
```

{% endcode %}

**Tax head master service configuration**

{% code lineNumbers="true" %}

```
{
      "category": "ADVANCE_COLLECTION",
      "service": "WS",
      "name": "Ws advance carry forward",
      "code": "WS_ADVANCE_CARRYFORWARD",
      "isDebit": true,
      "isActualDemand": false,
      "order": "0",
      "isRequired": true,
      "IsBillamend": false
    },
```

{% endcode %}

### **Existing Service Code Changes**  **Billing service changes:**

* Creating a new bill for the advance amount in BillServiceV2.\
  Removing the following line while adding the bill objects to the list\
  `if (billAmount.compareTo(BigDecimal.ZERO) >= 0)`
* Passing Active status filter for demand search during apportioning in DemandService.\
  `DemandCriteria searchCriteria = DemandCriteria.builder().tenantId(tenantId)`\
  `.status(Demand.StatusEnum.ACTIVE.toString()).consumerCode(Collections.singleton(consumerCode)). businessService(businessService).build();`
* New Demand audit history API in Demandcontroller.\
  An API that returns the audit history of demandDetails. `demand/_history`

**Water service changes:**

* Create water connection API :\
  Adding a check for payment type advance. If advance, passing a boolean isAdvanceCollection to calculationRequest to water calculator service.
* Update water connection API:\
  Adding a check for payment type advance. If advance, passing a boolean isAdvanceCollection to calculationRequest to water calculator service.\
  Adding a check for advance in the validateUpdate method to set the current demand to CANCELLED.

**Water calculator service changes:**

* Calling estimation service getEstimationMap based on isAdvanceCalculation boolean. If true, reading taxAmount from criteria.getWaterConnection().getAdvance();
* Changes in getEstimatesForTax for a new taxHeadCode ADVANCE\_COLLECTION with value WS\_ADVANCE\_CARRYFORWARD
* Getting the advance amount in getCalculation with taxHeadCode ADVANCE\_COLLECTION\
  4.Calling generateDemand method based on isAdvanceCalculation. If true, create a demand object with consumerType “waterConnection-advance“.


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