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It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.
To get an image of your blocks, right click in the Blocks Editor and select "Download Blocks as Image". You might want to use an image editor to crop etc. if required. Then post it here in the community.
I don't think it wants a string rather it wants a list in javascript format, I think although I do beleave the request headers are correct I am basing my programs login on this programs way of logging into scratch if I have some errors let me know
Taifun.
