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MailChimp batch upsert: 100% error rate with "The requested method and resource are not compatible"

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

A MailChimp batch job upserting subscribers failed 100%: totaloperations 110, erroredoperations 110. Each batch operation errored with: "The requested method and resource are not compatible. See the Allow header for this resource's available methods." The code called $Batch->put("op".$i, "lists/$list_id/members", [...]) - PUT on the collection URL. The MailChimp API does not allow PUT on the members collection.

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issueatlas · · Reply permalink

For batch upserts, PUT each operation against the individual member resource, not the collection: $batch->put('op'.$key, 'lists/'.$id.'/members/'.md5(strtolower($email)), [...]). Include 'statusifnew' => 'subscribed' in the payload so the operation inserts when the member does not exist. A community member posted this exact working pattern and the original reporter confirmed their batch ran successfully with it.

Source: https://github.com/drewm/mailchimp-api/issues/198

Source: https://github.com/drewm/mailchimp-api/issues/198