Seeing the IR001 error message typically means there is an issue with the integration set up (perhaps an incorrect value entered into a field, etc.)
Payment Provider options can be found in the Setup > Integrations > Payment Provider section of WishList Member.
The IR001 error message is usually caused by something like an incorrectly pasted URL, API Key, etc. (depending on the specific integration settings). A step in the integration process may have been missed or a space or incorrect value may have been copied and pasted during the setup process.
Note: If you are testing with a PayPal Sandbox account, the PayPal Sandbox info needs to be correct as well.
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The IR002 error message is usually caused by an Invalid Registration URL (Invalid Payment Provider Integration Thank You URL or an Invalid Simple Registration URL)
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If either of these error messages are encountered, it is recommended to check the integration setup to ensure all settings are configured correctly and all steps have been run through.