Relate contact to deal via Rest API

Relate contact to deal via Rest API

Hi everybody,

Someone know witch is the best way to relate contact with deal in Bigin via API?

I tried method explained in documentation but system return the following error:
  1. DOC reference: https://www.bigin.com/developer/docs/apis/update-related-records.html
  2. Error: INVALID_DATA
    1. Details: resource_path_index => 2
    2. Message: the relation name given seems to be invalid
Hope its will be useful and someone can help me
Thank's everybody

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