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Create Subscription API Failed

While calling the subscription endpoint I am getting this error

"description":"Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Billsby.Controllers.Subscriptions.InputModels.CouponCodeInputModel]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly. To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object. Path 'couponCodes.planId', line 1, position 416."

It's when I pass the planId.

Can you guide me why this is happening?