How can I efficiently structure this code in Laravel?

I have a class called Sharer, which accepts a Service interface in the construct method. Service can be FacebookService or TwitterService and so on. Each Service class has a post method, that posts whatever array data you pass to that method, using its own connection (either facebook, twitter in this example).

Now the Sharer class normalizes data before sending it to that service's post method. By normalizing, it checks whether the thing we are sending to that post method is just a simple array or a Model class. Model can be either Project model, or Image model, or Video model and so on.

If it is a model class, then it calls that specific model's transformer. Transformers are just helper classes, that accept the model instance and they have two methods - facebook and twitter in this case. And each method returns a formatted array, specific to the connection.

So for example, facebook method grabs the required fields (that are needed to post on facebook) from the model and sends that array back. And twitter method does the same for twitter's required fields.

Now the thing I am a bit stuck with, is calling that specific method on the transformer class. I want to do something like this:

if(we are sharing on facebook) {
   then call the facebook method
}

if(we are sharing on twitter) {
   then call the twitter method
}

but obviously I want to somehow make it dynamic and not have these if statements. What would be a better approach to this?

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