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Hey there! I've been trying to test out the HeyGen API on the Free tier (10 credits), but I'm running into an issue during video generation. Here's what's happening:

The photo and audio uploads are working perfectly:

Photo upload response:
{
"code": 100,
"data": {
"talking_photo_id": "8dc382397cf1422998afee51cfc4247d",
"talking_photo_url": "https://files2.heygen.ai/..."
}
}

Audio upload response:
{
"code": 100,
"data": {
"id": "16c5491c3dcc4639b066c8e403522ce7",
"file_type": "audio",
"url": "https://resource2.heygen.ai/..."
}
}

But when I try to generate the video with this request:
{
"video_inputs": [
{
"character": {
"type": "talking_photo",
"talking_photo_id": "8dc382397cf1422998afee51cfc4247d",
"scale": 1.0,
"talking_photo_style": "square"
},
"voice": {
"type": "audio",
"audio_asset_id": "16c5491c3dcc4639b066c8e403522ce7"
},
"background": {
"type": "color",
"value": "#FFFFFF"
}
}
],
"dimension": {
"width": 1920,
"height": 1080
}
}

I get this error:
{
"data": null,
"error": {
"code": "internal_error",
"message": "Something is wrong, please contact [email protected]"
}
}

I've double-checked the documentation and my request seems correct. Both the photo and audio uploads are successful, but something's going wrong at the video generation step. I'm using the Free tier with 10 credits - is there something I'm missing in my request, or is this feature not available on the Free tier?

Any help would be greatly appreciated! Thanks!