iPhone photo won’t upload? Convert HEIC/HEIF to a website-friendly JPG.
{}
POST returns HTTP 402 Payment Required until paid.
curl -s -X POST https://gate402.app/v1/heic-to-jpg \
-H 'content-type: application/json' \
-d '{…}'
# → 402, then retry with PAYMENT-SIGNATURE / X-PAYMENT