PayWithAmazon\Client::setParametersAndPost PHP Method

    private function setParametersAndPost($parameters, $fieldMappings, $requestParameters)
    {
        /* For loop to take all the non empty parameters in the $requestParameters and add it into the $parameters array,
         * if the keys are matched from $requestParameters array with the $fieldMappings array
         */
        foreach ($requestParameters as $param => $value) {
            if (!is_array($value)) {
                $value = trim($value);
            }
            if (array_key_exists($param, $fieldMappings) && $value != '') {
                if (is_array($value)) {
                    // If the parameter is a provider_credit_details or provider_credit_reversal_details, call the respective functions to set the values
                    if ($param === 'provider_credit_details') {
                        $parameters = $this->setProviderCreditDetails($parameters, $value);
                    } elseif ($param === 'provider_credit_reversal_details') {
                        $parameters = $this->setProviderCreditReversalDetails($parameters, $value);
                    }
                } else {
                    // For variables that are boolean values, strtolower them
                    if ($this->checkIfBool($value)) {
                        $value = strtolower($value);
                    }
                    $parameters[$fieldMappings[$param]] = $value;
                }
            }
        }
        $parameters = $this->setDefaultValues($parameters, $fieldMappings, $requestParameters);
        $responseObject = $this->calculateSignatureAndPost($parameters);
        return $responseObject;
    }