wikimedia/mediawiki-extensions-DonationInterface

( function ( $, mw ) {
    var di = mw.donationInterface,
        oldSubmit = di.forms.submit;

    function showIframe( result ) {
        // Remove any preexisting iFrames
        $( '#ingenico-div' ).remove();

        // Don't let people edit name, address, or email, since we won't
        // see any changes they make while the iframe is open.
        di.forms.disableInput();
        var $div = $( '<div>' ).attr( { id: 'ingenico-div' } ),
            $form = $( '<iframe>' )
            .attr( {
                src: result.iframe,
                frameborder: 0,
                name: 'ingenico-iFrame',
                id: 'ingenico-iFrame'
            } );
        $div.append( $form );
        $( '#payment-form' ).append( $div );
    }

    function redirect( result ) {
        document.location.replace( result.redirect );
    }

    di.forms.submit = function () {
        var paymentMethod = $( '#payment_method' ).val(),
            isIframe = di.forms.isIframe();
        if ( !isIframe && paymentMethod !== 'cc' ) {
            return oldSubmit();
        }
        di.forms.callDonateApi( function ( result ) {
            var url = result.redirect || result.iframe;
            if ( url.length < 100 ) {
                $.ajax( {
                    url: mw.util.wikiScript( 'api' ),
                    data: {
                        action: 'logPaymentsFormError',
                        message: 'Redirect/iframe URL suspiciously short! response was: ' +
                            JSON.stringify( result ),
                        userAgent: navigator.userAgent
                    },
                    dataType: 'json',
                    type: 'POST'
                } );
            }
            if ( isIframe && !result.redirect ) {
                showIframe( result );
            } else {
                redirect( result );
            }
        } );
    };
} )( jQuery, mediaWiki );