I have copied the name of the list and the group directly from mailchimp, but the error that appears is:
note: I have hidden API KEY for security
[05/05/2020 3:57:22 PM] – Updating payment intent data.
[05/05/2020 3:57:22 PM] – Firing asp_stripe_payment_completed action.
[05/05/2020 3:57:22 PM] – [MailChimp] Starting MailChimp signup process.
[05/05/2020 3:57:22 PM] – [MailChimp] Mailchip list name for this product: Rejuega
[05/05/2020 3:57:22 PM] – [MailChimp] Found list ID in cache.
[05/05/2020 3:57:23 PM] – [MailChimp] Found audience group name in “Rejuega” list. Group name: Ebook-100-juegos
[05/05/2020 3:57:23 PM] – [MailChimp] FAILURE: API error occured during signup: 400: Your merge fields were invalid.