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API key check and settings save fail with errors

Plugin settings cannot be saved and the API key cannot be verified, returning 401 or 500 errors during setup.

Tier II · Emerging Problems that are still building up.

3 public reports · first reported 21 July 2023 · last reported 15 October 2026

Idea report · $9 · No contacts · All sales final

See a sample idea report

What's going wrong

Site owners installing this WooCommerce to MailerLite connector report that the API key will not verify, the connect step returns a server error, and saved changes such as checkout checkbox wording revert after a refresh.

AI-assisted: written with the help of AI from the reports. The idea report has the full summary.

In the idea report

  • The full summary.
  • The products the 3 reports are about, and how many came each month.
  • Related problems.

No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.