a.rb

class HTTPProductGateway
  def find_by(id:)
    @id = id
    
    product_for(decode(fetch_product_from_api))
  end
  
  private
  
  def product_for(product_payload)
    Product.new(name: product_payload[:name], description: product_payload[:description])
  end
  
  def fetch_product_from_api
    HTTP.get(uri).response.body
  end
  
  def decode(api_product)
    JSON.decode(api_product)
  end
  
  def uri
    "https://example.com/api/products/#{@id}"
  end
end

b.rb

class HTTPProductGateway
  def find_by(id:) 
    product_for(decode(fetch_product_from_api(id)))
  end
  
  private
  
  def product_for(product_payload)
    Domain::Product.new(name: product_payload[:name], description: product_payload[:description])
  end
  
  def fetch_product_from_api(id)
    HTTP.get(uri(id)).response.body
  end
  
  def decode(api_product)
    JSON.decode(api_product)
  end
  
  def uri(id)
    "https://example.com/api/products/#{id}"
  end
end