def payment_request(options, &block)
      set_options(options, &block)
      post('payment-requests', options)
      @response.success? ? Instamojo::PaymentRequest.new(@response.body[:payment_request], self) : @response
    end
def payment_request(options, &block)
      set_options(options, &block)
      post('payment-requests', options)
      @response.success? ? Instamojo::PaymentRequest.new(@response.body[:payment_request], self) : @response
    end
POST /payment-requests