postProcess(xml) { let secHeader = wsseSecurityHeaderTemplate({ cert: this.publicP12PEM, serialNumber: this.certSerial, issuerName: this.issuer }); let xmlWithSec = insertStr(secHeader, xml, xml.indexOf('</soap:Header>')); this.signer.computeSignature(xmlWithSec); return insertStr(this.signer.getSignatureXml(), xmlWithSec, xmlWithSec.indexOf('</wsse:Security>')); }