When opt-in is disabled it fails to validate checkout data, because it expects mailpoet.optin to present. This PRs skips extending checkout data schema in case the opt-in is disabled. [MAILPOET-4004]
When opt-in is disabled it fails to validate checkout data, because it expects mailpoet.optin to present. This PRs skips extending checkout data schema in case the opt-in is disabled. [MAILPOET-4004]