Hi, @_maksym,
Thank you for posting. One approach you can consider is to decode the signature, the format will be JSON Web Token,
Addendum
If using SDK App type, debug by https://jwt.io
Example signature created with SDK App type:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzZGtLZXkiOiJhYmMxMjMiLCJtbiI6IjEyMzQ1Njc4OSIsInJvbGUiOjAsImlhdCI6MTY0NjkzNzU1MywiZXhwIjoxNjQ2OTQ0NzUzLCJhcHBLZXkiOiJhYmMxMjMiLCJ0b2tlbkV4cCI6MTY0Njk0NDc1M30.UcWxbWY-y22wFarBBc9i3lGQuZAsuUpl8GRR8wUah2M
jwt.io
In the PAYLOAD section, you can see the values and debug them there.
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If using JWT App type, debug by base64decoding it. Here is a helpful forum post you can reference on this topic as well: