spree_paypal_express/app/models/spree/paypal_account.rb

class Spree::PaypalAccount < ActiveRecord::Base
  attr_accessible :email, :payer_id, :payer_country, :payer_status
  has_many :payments, :as => :source

  def actions
    %w{capture credit adjust}
  end

  def can_capture?(payment)
    !echeck?(payment) && payment.state == "pending"
  end

  def can_adjust?(payment)
    can_capture?(payment)
  end

  def can_credit?(payment)
    return false unless payment.state == "completed"
    return false unless payment.order.payment_state == "credit_owed"
    payment.credit_allowed > 0
    !payment.payment_method.find_capture(payment).nil?
  end

  # fix for Payment#payment_profiles_supported?
  def payment_gateway
    false
  end

  def echeck?(payment)
    logs = payment.log_entries.all(:order => 'created_at DESC')
    logs.each do |log|
      details = YAML.load(log.details) # return the transaction details
      if details.params['payment_type'] == 'echeck'
        return true
      end
    end
    return false
  end

end