removing class << self and using self.methods
removing @user.id from parameters
replacing method name add_update_credit_card with add_or_update_credit_card
removing method has_payment_info?
replaced method convert_in_date with convert_to_date
replaced method braintree_customers with create_customer_on_braintree
documenting service methods
adding plan link on header
condition on update credit card form
pass current_user while initializing the braintree service
documenting service methods
refactored the code for thin controllers
replaced "transactions" with "subscription"
added some documentation for service
fixed the indentation