Extending a reward modifies the expiry date according to the specified parameters in the payload.
The Extend Reward endpoint allows developers to specify either an extend_days or extend_date

Provide an array of ID's and search the specified profile_id for eligible rewards.
Each eligible reward will be extended according to either the extend_days or extend_date

Attribute	Description
`profile_id` `STRING`	The profile ID containing the rewards to extend
`ids` `ARRAY`	An array of reward id's. Each reward id specified will be extended.
`extend_days` `INTEGER`	The amount of days to extend. This will be added to the existing `expires_at` date to calculate the new expiry Cannot be specified if an`extend_date` is provided
`extend_date` `DATE-TIME`	This date-time string will replace the existing `expires_at` value Cannot be specified if`extend_days` is provided

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Eligible Rewards for extension
Rewards can only be extended once
This means the extended_at field must be null to be eligible for an extension