HTTP error 403 (Could not open Woocommerce authorization page)

I uninstall all caching plugin including disabling Cloudflare and now I can see Printful Rest API on WooCommerce. I can also see WooCommerce store in Printful but still cannot sync

Hey! Something went wrong with sync.

Last sync error: Error: Invalid response from your WooCommerce store. Please make sure your site is working and no plugins are blocking WooCommerce API access
Try to refresh data. If error persists, contact customer support.

@robertpurnomo It is possible with all the attempts to connect, even though reducing the situation to the least common denominator (only the WooCommerce Plugin and the Printful plugin) the repeat API connection attempt threw a red flag on your host which resulted in an automatic black listing of the connecting IP. The problem with Hostinger virtual hosting, you don’t have the ability to personally dig deep into the hosting to see if there is a block. The main reason I have a dedicated hosting server, I can service every possible scenario without having to wait on a support person NOT to figure it out. I would set it back to the basics (on the two plugins) and then call Hostinger to look over the connectivity.

If you are using a Hostinger account with Cloudflare, that adds another level of complications other Printful users completely fail to anticipate. You do need an IP white list installed to prevent the sync from being blocked (even if not using Cloudflare or another CDN). Here is a post that digs deep into this issue with a IP whitelist solution: https://community.cloudflare.com/t/cloudflare-blocks-printful-woocommerce-integration/357449/9

Granted, some of the IPs could have been changed by now since it was a 2022 support thread, but an email to Printful support might gain you a fresh IP list, although it is reported that they will not share them.

I just delete the old website and create a completely new website with only WooCommerce plugin and Printful plugin, but still get the same error “Dang it. Could not open Woocommerce authorization page (HTTP error 403). Make sure?https://shibainuofwallstreet.com/wc-auth/v1/authorize?is accessible.”

So @artiosmedia is probably right. Repeat API connection attempt most likly threw a red flag on Hostinger which resulted in an automatic black listing of the connecting IP

I finally solved the problem and Printful sync with WooCommerce. Cloudflare Bot fight mode is blocking Printful WooCommerce Integration.

So all you need to do is either disable Cloudflare Bot Fight Mode or create custom rule to “skip” for “User Agent: Printful WooCommerce Integration”

https://community.cloudflare.com/t/cloudflare-blocks-printful-woocommerce-integration/357449

Great to hear you have found the issue. Yes, Cloudflare Bot Fight Mode is a problem for many API’s and third-party connectivity. Again, this is where IP whitelisting solves the problem.

Better yet, Bunny CDN Network is superior to Cloudflare on several levels, fully eliminating many of these types of bottlenecks.
https://bunny.net/network/