salix/back/methods/mrw-config/getLabel.js

module.exports = Self => {
    Self.remoteMethod('getLabel', {
        description: 'Return a base64Binary label from de MRW WebService',
        accessType: 'READ',
        accepts: [{
            arg: 'shipmentId',
            type: 'string',
            required: true
        }],
        returns: {
            type: 'string',
            root: true
        },
        http: {
            path: `/getLabel`,
            verb: 'GET'
        }
    });

    Self.getLabel = async shipmentId => {
        const mrw = await Self.getConfig();

        const getLabelResponse = await Self.sendXmlDoc(__dirname + `/getLabel.ejs`, {mrw, shipmentId}, 'text/xml');

        return Self.getTextByTag(getLabelResponse, 'EtiquetaFile');
    };
};