src/main/php/com-realexpayments-hpp-sdk/domain/HppRequest.php
public function addValidateCardOnly( $validateCardOnly ) {
		if ( is_bool( $validateCardOnly ) ) {
			$this->validateCardOnly = $validateCardOnly ? Flag::TRUE : Flag::FALSE;
		} else {
			$this->validateCardOnly = $validateCardOnly;
		}

		return $this;
	}
public function addValidateCardOnly( $validateCardOnly ) {
		if ( is_bool( $validateCardOnly ) ) {
			$this->validateCardOnly = $validateCardOnly ? Flag::TRUE : Flag::FALSE;
		} else {
			$this->validateCardOnly = $validateCardOnly;
		}

		return $this;
	}
Helper method for adding a validateCardOnly

@param String|bool $validateCardOnly

@return HppRequest