Generate UGC ad reels from product photos with DeepSeek and kie.ai

Description

Quick overview
Turn one product photo into a voiced, ready-to-post UGC ad video in minutes. Writes the script with DeepSeek, generates a talking vertical video with kie.ai, saves it to Drive before the link expires, and logs every result to Sheets — no camera, no actor, no editor needed.

How it works
Receives a new request from an n8n form submission containing a product photo, ad prompt, brand name, and target language.
Uploads the product photo to Google Drive, makes the file publicly accessible, and builds a direct-download image URL for external use.
Sends the brand, language, and ad prompt to DeepSeek Chat Completions to generate a 15–20 second spoken ad script.
Submits the script and the public image URL to kie.ai to create a Seedance 2 Mini video generation task with audio enabled.
Polls kie.ai at 20-second intervals until the task returns a success or failure state.
On success, downloads the generated video, uploads it to Google Drive, and appends a “Success” row (including the Drive link) to a Google Sheets log.
On failure, captures the provider error message and appends a “Failed” row to the same Google Sheets log.

Setup
Connect Google Drive OAuth2 credentials and choose the Drive/folder where uploaded photos and generated videos should be stored.
Create a Google Sheet with a tab named UGC_Ad_Library, connect Google Sheets OAuth2 credentials, and replace YOUR_UGC_LIBRARY_SHEET_ID with your document ID.
Add a DeepSeek API key as an HTTP Header Auth credential (Bearer token) for the script generation request.
Add a kie.ai API key as an HTTP Header Auth credential for creating tasks and checking status.
Replace the placeholder callBackUrl (https://example.com/callback) with a valid URL expected by kie.ai (even if you rely on polling).