Changing Installation ID on Cart/Checkout

Topic summary

Request to change the Worldpay “Installation ID” used on the site’s cart/checkout, but the author cannot find where to edit it and was told the change must be made on the site itself.

Context: The Installation ID is the identifier for a Worldpay payment installation that routes transactions; updating it normally involves modifying payment gateway settings or the site’s integration configuration. No platform or admin area was specified, and no code snippets or screenshots were provided.

Current status: No answers or guidance yet. Key open question: where in the site (admin payment settings vs. code/config files) should the Installation ID be updated to switch Worldpay installations? Discussion remains unresolved and awaiting instructions or pointers to the correct settings/location.

Summarized with AI on December 27. AI used: gpt-5.

Can anyone help, been asked to change the Installation ID for Worldpay, but can’t find anything or anywhere that I would change this. They stated it would need to be done on site. Any help would be appreciated.