# Classifiers and Parameters Management
source: https://developer.mastercard.com/mastercard-processing-core/documentation/use-cases/classifiers-and-parameters-management/index.md

The use cases in this section provide various scenarios for managing classifiers and parameters.
Refer to [Classifiers](https://developer.mastercard.com/mastercard-processing-core/documentation/guides/card-management-system/index.md#parameters) or [Parameters](https://developer.mastercard.com/mastercard-processing-core/documentation/guides/card-management-system/index.md#parameters) guides for more information.

Each use case provides the following information:

* A brief description of the use case
* A sequence diagram
* A detailed explanation
* A part of API specification with the endpoint(s) used in the use case

The following use cases are provided in this section:

|                                                                                    Use case                                                                                     |      OperationId       | Method |                          URI                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------|--------|--------------------------------------------------------|
| [Set Classifier](https://developer.mastercard.com/mastercard-processing-core/documentation/use-cases/classifiers-and-parameters-management/set-classifier/index.md)             | setClientClassifier    | PUT    | /clients/{client_id}/classifiers/{classifier_code}     |
|                                                                                                                                                                                 | setContractClassifier  | PUT    | /contracts/{contract_id}/classifiers/{classifier_code} |
| [Retrieve Classifiers](https://developer.mastercard.com/mastercard-processing-core/documentation/use-cases/classifiers-and-parameters-management/retrieve-classifiers/index.md) | getClientClassifiers   | GET    | /clients/{client_id}/classifiers/{classifier_code}     |
|                                                                                                                                                                                 | getContractClassifiers | GET    | /contracts/{contract_id}/classifiers/{classifier_code} |
| [Set Parameter](https://developer.mastercard.com/mastercard-processing-core/documentation/use-cases/classifiers-and-parameters-management/set-parameter/index.md)               | setContractParameter   | PUT    | /contracts/{contract_id}/parameters/{parameter_code}   |
| [Retrieve Parameters](https://developer.mastercard.com/mastercard-processing-core/documentation/use-cases/classifiers-and-parameters-management/retrieve-parameters/index.md)   | getContractParameters  | GET    | /contracts/{contract_id}/parameters/{parameter_code}   |