Signing a Soap Message in PHP returns a fault

We need help understanding our error in sending a signed SOAP message using PHP to a partner site.

No one at the partner knows the details of their SOAP processor.
The partner says they are using a v1.1 SOAP processor.
The partner has only tested using a Java library, but we must use PHP.

When we send the below message, the response is "Signature verification failed".
I hope that someone can parse our message and tell us of any issues that are seen.

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:add="http://www.americanexpress.com/PAYVE/OrganizationManagementService/V1/addOrganizationInfo" xmlns:v4="http://www.americanexpress.com/PAYVE/ServiceHeader/V4">
<soapenv:Header>
<wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<wsse:BinarySecurityToken EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" wsu:Id="X509-0cc4833c058d39310000887b60a60349">
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</wsse:BinarySecurityToken>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="SIG-6b819be0863586280000065a73ef65b3">
<ds:SignedInfo>
<ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
<ec:InclusiveNamespaces PrefixList="add soapenv" xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</ds:CanonicalizationMethod>
<ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<ds:Reference URI="#reqBody">
<ds:Transforms>
<ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
<ec:InclusiveNamespaces PrefixList="add" xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</ds:Transform>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<ds:DigestValue>
lkeA5TqwqnyHSSXj8oFEG5kHSwQ=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue>
PV5JuunxFMgEBr3jUTbyELQ61kQiqmHKfAWdGqsbpOV3QuhCtsNX0FQHH8dGm6xDUuOqcrkn569t0BD/tc4Ld8lTHstDrHZUI7qIdZBK54TNETGSZCGhrIjJqkgITGkrXj4deY0+rfDWBZIA7aoxMgzG2zffYSNGjJFJ5fk2/k6AGpoYaVPdjRQly4D4cq8umbR/yP38yvHYCu16KDWP0F97wVSUOvZ5mGR//4CDWCclpFnFTp998s1Iolefuf2FVO33ra4aZwqZGO67v1xgukawb9E8fLwTQWxOQ6qrfSGkIkRkHXjfhAusTYyBtWcYe5tKRO6/r4oMIBHI88pAig==</ds:SignatureValue>
<ds:KeyInfo Id="KI-5f258aa7bb6b422a000073ec6c47f1dd">
<wsse:SecurityTokenReference wsu:Id="STR-c1605b6a9033ecc50000ed544348b4ea">
<wsse:Reference URI="#X509-0cc4833c058d39310000887b60a60349" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"/>
</wsse:SecurityTokenReference>
</ds:KeyInfo>
</ds:Signature>
</wsse:Security>
</soapenv:Header>
<soapenv:Body wsu:Id="reqBody" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<add:addOrganizationInfo>
  <add:Request>
    <add:ServiceAttributesGrp>
      <add:MinorVer>?</add:MinorVer>
    </add:ServiceAttributesGrp>
    <add:AddOrganizationInfoReqGrp>
      <add:TxnIdentifier>test-trx-114</add:TxnIdentifier>
      <add:OrganizationInfo>
        <add:PartnerEntityId>test-partner-111</add:PartnerEntityId>
        <add:OrgNm>test-org-114</add:OrgNm>
        <add:OrgId>test-orgid-114</add:OrgId>
        <add:PaymentMethods>
          <add:PaymentMethod>CH</add:PaymentMethod>
        </add:PaymentMethods>
        <add:CustFeeBillInd>?</add:CustFeeBillInd>
        <add:ContactDetail>
          <add:PrimaryEmailID>testemail114@me.com</add:PrimaryEmailID>
          <add:PrimaryPhone>1111111114</add:PrimaryPhone>
        </add:ContactDetail>
        <add:OrganizationAddr>
          <add:Address1>test line 1</add:Address1>
          <add:Address2>test line 2</add:Address2>
          <add:City>San Jose</add:City>
          <add:State>CA</add:State>
          <add:Country>USA</add:Country>
          <add:ZipCd>95112</add:ZipCd>
        </add:OrganizationAddr>
        <add:CheckDetails>
          <add:CheckSettings/>
        </add:CheckDetails>
      </add:OrganizationInfo>
    </add:AddOrganizationInfoReqGrp>
  </add:Request>
</add:addOrganizationInfo>
</soapenv:Body>
</soapenv:Envelope>

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