UPDATE: Fixedfloat contacted my customer and i am transfering message in full as copyed to me(i didn't get CCed) he contacted me that they replied to email with following sentence:
Hello,
We need the following information from you, as the sender of funds for the order:
1. How do you find customers or do they find you?
2. What kind of services do you provide? Send us your service announcement (screenshot or link to your ad).
3. Where do you communicate with customers?
Best regards,
FixedFloat team.
Were your customer willing to answer to that? Though in one side it is [IMO] very intrusive and a gross practice of violation to privacy, this might put an end to everything. From the points being asked, they seemed just trying to match the story.