Endpoints
Create an instalment
POST /v1
Close an existing instalment plan
POST /v1/{instalmentId}/close
Get instalment plans for a given account
GET /v1/account/{accountId}
Get instalment portions
GET /v1/{instalmentId}/portions/
Get Instalment by id
GET /v1/{instalmentId}
Get Instalment by transactionId
GET /v1/transaction/{transactionId}