Problem with snapchat

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I have a problem with my site which is on the custom theme speedfly.

I pay an influencer who publishes advertising on snapchat in story, and when the customer wants to buy from snapchat it marks him a page with written:

"Parameter missing or invalid: Required parameter missing or invalid: items"

I have already tried to change the theme, but it only works with Debut theme, and I want to use a custom theme.

Can I help?

Thank you