CAT_VALIDATION_ERROR_SALE_PRICE_INVALID indicates sale_price uses the wrong format, missing currency code, or a non-numeric value. Format as '12.99 USD' with a single space separator.
Snap Catalog Manager's product schema has format and value rules per attribute. This issue is typically: missing a required attribute for the category, an invalid enum value (e.g., 'XL' submitted where 'M, L, XL' is the valid set), out-of-range numbers, or attributes that conflict across the feed.