app/code/community/Adyen/Payment/Helper/Installments.php
public function makeStorableArrayFieldValue($value)
    {
        if ($this->_isEncodedArrayFieldValue($value)) {
            $value = $this->_decodeArrayFieldValue($value);
        }

        $value = $this->_serializeValue($value);
        return $value;
    }
public function makeStorableArrayFieldValue($value)
    {
        if ($this->_isEncodedArrayFieldValue($value)) {
            $value = $this->_decodeArrayFieldValue($value);
        }

        $value = $this->_serializeValue($value);
        return $value;
    }
public function makeStorableArrayFieldValue ( $ value ) { if ( $ this -> _isEncodedArrayFieldValue ( $ value ) ) { $ value = $ this -> _decodeArrayFieldValue ( $ value ) ; } $ value = $ this -> _serializeValue ( $ value ) ; return $ value ; }
Make value ready for store

@param mixed $value
@return string
Make value ready for store