Such plugins should add a settings page to the main settings screen, under an integrations tab. If they are using that API that is.
That is the problem, i dont want to use this method.
I’m not really sure what you’re asking here. If you’re using an ‘integration’ though the integration API, you need to use the setting screens.
If you’re not, and this is just a plugin external to WooCommerce, you use the options API to set values https://codex.ww.wp.xz.cn/Options_API
Options API can also be used to manually change values in an integration but the option is a serialised array of values, so you need to work with that data structure to avoid breaking them.
That’s what i need. Dont you have some examples, of how to work with integration from options api?
I don’t document examples for edge cases. The option name will be woocommerce_YOURINTEGRATIONID_settings. I’d suggest you get_option and var_dump this to see the structure. It will be an array of keys and values.