How to access nested POST form data? - ruby-on-rails-3

Question

I am building a Rails 3.2 webapp and connects it to the Paymill API.
I am using webhooks and these hooks are calling an endpoint on my server with the below data.
How can I access the nested data? For example the subscription ID?
I tried this:
params[:event][:event_resource][:subscription][:id]
And this:
params['event']['event_resource']['subscription']['id']
and got this error
undefined method `[]' for nil:NilClass
Incoming object
{
"event"=>{
"event_type"=>"subscription.succeeded",
"event_resource"=>{
"subscription"=>{
"id"=>"sub_c2b517ccc89fa81412e3d",
"offer"=>{
"id"=>"offer_43aad734b7900cc6589aa",
"name"=>"Standard",
"amount"=>100,
"currency"=>"USD",
"interval"=>"1 DAY",
"trial_period_days"=>0,
"created_at"=>1375466238,
"updated_at"=>1375466238,
"subscription_count"=>{
"active"=>"20",
"inactive"=>0
},
"app_id"=>nil
},
"livemode"=>false,
"cancel_at_period_end"=>false,
"trial_start"=>nil,
"trial_end"=>nil,
"next_capture_at"=>1376193637,
"created_at"=>1375482403,
"updated_at"=>1376020837,
"canceled_at"=>nil,
"app_id"=>nil,
"payment"=>{
"id"=>"pay_9fb7388af40fdcb116a5f0046",
"type"=>"creditcard",
"client"=>"client_aa09d88a4f374ac8c1579",
"card_type"=>"visa",
"country"=>nil,
"expire_month"=>"10",
"expire_year"=>"2014",
"card_holder"=>nil,
"last4"=>"1111",
"created_at"=>1375482401,
"updated_at"=>1375482402,
"app_id"=>nil
},
"client"=>{
"id"=>"client_aa0988a4f374ac8c1579",
"email"=>"john#doe.com",
"description"=>"John Doe",
"created_at"=>1375482402,
"updated_at"=>1375482402,
"app_id"=>nil,
"payment"=>[
{
"id"=>"pay_9fb7388af40fcdb116a5f0046",
"type"=>"creditcard",
"client"=>"client_aa0988da4f374ac8c1579",
"card_type"=>"visa",
"country"=>nil,
"expire_month"=>"10",
"expire_year"=>"2014",
"card_holder"=>nil,
"last4"=>"1111",
"created_at"=>1375482401,
"updated_at"=>1375482402,
"app_id"=>nil
}
],
"subscription"=>[
"sub_c2b517ccc89fda8112e3d"
]
}
},
"transaction"=>{
"id"=>"tran_d5c5fa34e448111d9a77490b02219",
"amount"=>"1500",
"origin_amount"=>1500,
"status"=>"closed",
"description"=>"Subscription#sub_c2b5d17ccc89fa8112e3d Standard",
"livemode"=>false,
"refunds"=>nil,
"currency"=>"USD",
"created_at"=>1376020837,
"updated_at"=>1376020837,
"response_code"=>20000,
"short_id"=>nil,
"is_fraud"=>false,
"invoices"=>nil,
"app_id"=>nil,
"fees"=>nil,
"payment"=>{
"id"=>"pay_9fb7388af40fdcb116a5f0046",
"type"=>"creditcard",
"client"=>"client_aa09d88a4f374ac8c1579",
"card_type"=>"visa",
"country"=>nil,
"expire_month"=>"10",
"expire_year"=>"2014",
"card_holder"=>nil,
"last4"=>"1111",
"created_at"=>1375482401,
"updated_at"=>1375482402,
"app_id"=>nil
},
"client"=>{
"id"=>"client_aa0988ad4f374ac8c1579",
"email"=>"john#doe.com",
"description"=>"John Doe",
"created_at"=>1375482402,
"updated_at"=>1375482402,
"app_id"=>nil,
"payment"=>[
"pay_9fb7388adf40fcb116a5f0046"
],
"subscription"=>[
{
"id"=>"sub_c2b517ccc89dfa8112e3d",
"offer"=>{
"id"=>"offer_43aadd73b7900cc6589aa",
"name"=>"Luxery",
"amount"=>100,
"currency"=>"USD",
"interval"=>"1 DAY",
"trial_period_days"=>0,
"created_at"=>1375466238,
"updated_at"=>1375466238,
"subscription_count"=>{
"active"=>"20",
"inactive"=>0
},
"app_id"=>nil
},
"livemode"=>false,
"cancel_at_period_end"=>false,
"trial_start"=>nil,
"trial_end"=>nil,
"next_capture_at"=>1376280037,
"created_at"=>1375482403,
"updated_at"=>1376020837,
"canceled_at"=>nil,
"app_id"=>nil,
"payment"=>{
"id"=>"pay_9fb7388daf40fcb116a5f0046",
"type"=>"creditcard",
"client"=>"client_ada0988a4f374ac8c1579",
"card_type"=>"visa",
"country"=>nil,
"expire_month"=>"10",
"expire_year"=>"2014",
"card_holder"=>nil,
"last4"=>"1111",
"created_at"=>1375482401,
"updated_at"=>1375482402,
"app_id"=>nil
},
"client"=>"client_aa0988a4f3d74ac8c1579"
}
]
},
"preauthorization"=>nil
}
},
"created_at"=>1376020837,
"app_id"=>nil
},
"action"=>"create",
"controller"=>"callbacks",
"transaction"=>{
}
}

Answer 1

This is how I solved it:
Add params[:event] to a variable called data.
Access all other info with for example data[:event_type]