Get product category IDs from Magento v2.0 SOAP API - magento

Question

How can i get the list of categories a product is a member of, using the Magento v2.0 SOAP web service?
On http://devdocs.magento.com/guides/v2.0/soap/bk-soap.html i found a list of services.
With the catalogProductRepositoryV1, i can request a list or a single product, but it doesn't contain the categories. eg:
Request:
POST http://domain/soap/default?services=catalogProductRepositoryV1 HTTP/1.1
Content-Type: application/soap+xml; charset=utf-8; action="catalogProductRepositoryV1Get"
Host: domain
Content-Length: 382
Expect: 100-continue
Accept-Encoding: gzip, deflate
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope">
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<catalogProductRepositoryV1GetRequest xmlns="http://domain/soap/default?services=catalogProductRepositoryV1">
<sku xmlns="">24-MB01</sku>
</catalogProductRepositoryV1GetRequest>
</s:Body>
</s:Envelope>
Response:
HTTP/1.1 200 OK
Date: Fri, 20 May 2016 12:21:46 GMT
Server: Apache/2.4.18 (Unix) OpenSSL/1.0.1e-fips mod_bwlimited/1.4 PHP/5.6.21
X-Powered-By: PHP/5.6.21
Set-Cookie: PHPSESSID=89fdd89a6caeb8be424b9531c69d6c69; expires=Fri, 20-May-2016 13:21:47 GMT; Max-Age=3600; path=/; domain=domain; HttpOnly
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 5547
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Connection: close
Content-Type: application/soap+xml; charset=utf-8
<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns1="http://domain/soap/default?services=catalogProductRepositoryV1">
<env:Body>
<ns1:catalogProductRepositoryV1GetResponse>
<result>
<id>1</id>
<sku>24-MB01</sku>
<name>Joust Duffle Bag</name>
<attributeSetId>15</attributeSetId>
<price>34</price>
<status>1</status>
<visibility>4</visibility>
<typeId>simple</typeId>
<createdAt>2016-01-22 16:28:25</createdAt>
<updatedAt>2016-04-20 09:51:54</updatedAt>
<extensionAttributes/>
<productLinks>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-MB03</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-MB05</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-MB06</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-MB02</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-UB02</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-WB03</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-WB07</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
<item>
<sku>24-MB01</sku>
<linkType>upsell</linkType>
<linkedProductSku>24-WB04</linkedProductSku>
<linkedProductType>simple</linkedProductType>
<position/>
<extensionAttributes/>
</item>
</productLinks>
<options/>
<mediaGalleryEntries>
<item>
<id>1</id>
<mediaType>image</mediaType>
<label>Image</label>
<position>1</position>
<disabled>false</disabled>
<types>
<item>image</item>
<item>small_image</item>
<item>thumbnail</item>
</types>
<file>/m/b/mb01-blue-0.jpg</file>
</item>
</mediaGalleryEntries>
<tierPrices/>
<customAttributes>
<item>
<attributeCode>description</attributeCode>
<value><p>The sporty Joust Duffle Bag can't be beat - not in the gym, not on the luggage carousel, not anywhere. Big enough to haul a basketball or soccer ball and some sneakers with plenty of room to spare, it's ideal for athletes with places to go.</p>
<ul>
<li>Dual top handles.</li>
<li>Adjustable shoulder strap.</li>
<li>Full-length zipper.</li>
<li>L 29" x W 13" x H 11".</li>
</ul></value>
</item>
<item>
<attributeCode>meta_title</attributeCode>
<value>Joust Duffle Bag</value>
</item>
<item>
<attributeCode>meta_keyword</attributeCode>
<value>Joust Duffle Bag</value>
</item>
<item>
<attributeCode>meta_description</attributeCode>
<value>Joust Duffle Bag <p>The sporty Joust Duffle Bag can't be beat - not in the gym, not on the luggage carousel, not anywhere. Big enough to haul a basketball or soccer ball and some sneakers with plenty of room to spare, it's ideal for athletes with places t</value>
</item>
<item>
<attributeCode>image</attributeCode>
<value>/m/b/mb01-blue-0.jpg</value>
</item>
<item>
<attributeCode>small_image</attributeCode>
<value>/m/b/mb01-blue-0.jpg</value>
</item>
<item>
<attributeCode>thumbnail</attributeCode>
<value>/m/b/mb01-blue-0.jpg</value>
</item>
<item>
<attributeCode>category_ids</attributeCode>
<value>
<xsd:string>3</xsd:string>
<xsd:string>4</xsd:string>
</value>
</item>
<item>
<attributeCode>options_container</attributeCode>
<value>container2</value>
</item>
<item>
<attributeCode>required_options</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>has_options</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>image_label</attributeCode>
<value>Image</value>
</item>
<item>
<attributeCode>small_image_label</attributeCode>
<value>Image</value>
</item>
<item>
<attributeCode>thumbnail_label</attributeCode>
<value>Image</value>
</item>
<item>
<attributeCode>msrp_display_actual_price_type</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>url_key</attributeCode>
<value>joust-duffle-bag</value>
</item>
<item>
<attributeCode>tax_class_id</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>activity</attributeCode>
<value>11,19,21,22</value>
</item>
<item>
<attributeCode>style_bags</attributeCode>
<value>25,26,29</value>
</item>
<item>
<attributeCode>material</attributeCode>
<value>37,38</value>
</item>
<item>
<attributeCode>strap_bags</attributeCode>
<value>61,62,63,64,65,66</value>
</item>
<item>
<attributeCode>features_bags</attributeCode>
<value>74,76,79</value>
</item>
<item>
<attributeCode>eco_collection</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>performance_fabric</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>erin_recommends</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>new</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>sale</attributeCode>
<value>0</value>
</item>
<item>
<attributeCode>eboekhouden_grootboekrekening</attributeCode>
<value>8000</value>
</item>
<item>
<attributeCode>eboekhouden_costcenter</attributeCode>
<value>0</value>
</item>
</customAttributes>
</result>
</ns1:catalogProductRepositoryV1GetResponse>
</env:Body>
</env:Envelope>

Answer 1

in the product detail SOAP Call i.e. catalogProductRepositoryV1
you will find category_ids as an item in customAttributes tag
<customAttributes>
...
<item>
<attributeCode>category_ids</attributeCode>
<value>
<xsd:string>3</xsd:string>
<xsd:string>4</xsd:string>
</value>
</item>
...
</customAttributes>
than you need to load the categories if you want any information of that from catalogCategoryRepositoryV1