Mailchimp API 2.0 lists/subscribe responding with error 250 List_MergeFieldRequired MMERGE4 is required -

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i'm attempting use lists/subscribe mailchimp api 2.0 endpoint subscribe email list, keep getting puzzling error. request looks like:

{     "apikey":"myapikey-us5",     "id":"listid",     "email":{"email":"my@email.com"},     "double_optin":false,     "send_welcome":true }

i'm sending https://us5.api.mailchimp.com/2.0/lists/subscribe.json , getting response:

{     "status": "error",     "code": 250,     "name": "list_mergefieldrequired",     "error": "mmerge4 must provided - please enter value" }

and if specify "merge_vars": {} still same error. missing here?

it means need provide value mmerge4 merge field. how depends on type of merge field mmerge4 is, this:

{     "apikey":"myapikey-us5",     "id":"listid",     "email":{"email":"my@email.com"},     "double_optin":false,     "send_welcome":true,     "merge_vars": {         "mmerge4": "something"     } }

but should , see type of data is, otherwise might cause issues whomever set required field.


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