original_string: public function _requestPayload()
      {
          $payload = [
              'authorization_code'    => $this->authorization,
              'amount'                => $this->amount,
              'reference'             => $this->transactionRef,
              'email'                 => $this->email,
          ];
  
          if (!empty($this->plan)) {
              $payload['plan'] = $this->plan;
          }
  
          return $this->toJson($payload);
      }
code: public function _requestPayload()
      {
          $payload = [
              'authorization_code'    => $this->authorization,
              'amount'                => $this->amount,
              'reference'             => $this->transactionRef,
              'email'                 => $this->email,
          ];
  
          if (!empty($this->plan)) {
              $payload['plan'] = $this->plan;
          }
  
          return $this->toJson($payload);
      }
code_tokens: public function _requestPayload ( ) { $ payload = [ 'authorization_code' => $ this -> authorization , 'amount' => $ this -> amount , 'reference' => $ this -> transactionRef , 'email' => $ this -> email , ] ; if ( ! empty ( $ this -> plan ) ) { $ payload [ 'plan' ] = $ this -> plan ; } return $ this -> toJson ( $ payload ) ; }
docstring: Get returning transaction request body.
  
  @return string
docstring_tokens: Get returning transaction request body .