In order to unsubscribe user from Centili platform you must use HTTP POST method in application/json format, sent to the following URL with parameters described below:

## POST opt-out request

## Parameters:

ParameterDescriptionExampleRequired as
**apikey**Centili issued service key, unique for every payment service.f31a355df6dad07e49ba474db7ff9b07 **mandatory**
**timestamp**Unix timestamp used to differentiate every request as a unique one. The number string represents seconds.1462888063 **mandatory**
**subscriptionid**Unique identifier of subscription in Centili system. If subscriptionID is used than **_userid_** parameter can be skipped.1234567optional
**userid**If userID is used than **_subscriptionid_** parameter can be skipped.usrId1983 _NOTE: If the value is not set within payment request, this field will contain MSISDN of the particular customer._optional
**sign**Signature parameter created using key issued for signing request. _NOTE: Please refer to the [signature key generation guide](🔗)._def0a0ba4f188cf174d383dc4d7f7041e358ba92optional

## Possible server responses

Server responseMeaningPossible Error messages
**HTTP 202 Accepted**User has been successfully unsubscribed./
**HTTP 400 Bad request**Unsubscribe request is invalid or cannot be resolved.-Bad request -Mandatory parameters missing! -Signature validation failed! -Subscription does not exists. -Action is not supported
**HTTP 406 Not Acceptable**Opt-out transaction already exists.There is already an outgoing opt-out process for this user.
**HTTP 500 Server error.**Some unexpected internal server error has occured.Server error.