Quote Originally Posted by OldNGrey View Post
Do you have dimensions on the products ie (products_weight [ this is built into Zen Cart]; products_height; products_width; products_length)?
If so what are they for product 1997?

The problem is not the 36 items, it's that the combined size or weight is calculated as larger than Australia Post will handle. So a valid quote is not returned.

I have a version 2.5.3 on my GitHub at https://github.com/OldNGreyBMR/aupos...ags/v2.5.3.zip
It is backwardly compatible with PHP7.

Please try it on your TEST system (NOT production). Once the files are copied over, you will need to uninstall and reinstall each module and add your API code and tax rates.
I'm pretty sure it's not a size and weight thing, the products have no sizes (there are no size fields in the product listing page anyway, and I can't see anything in the settings about an assumed volume for each product), it all goes by weight, and those weights vary but are quite small. That product is 5g, so 35 of them is just 175g. But, if you select a smaller product, such as a 5mm LED which is 0.5g, it still bombs at 36 items. Or any combination of items, regardless of weight, it's always when it hits 36.