Migrate from Affinity Fieldreach to Mailchimp

Blocklisted Affinity contacts still appear in the Mailchimp sync unless filtered before migration

The native Affinity Mailchimp integration only syncs one direction — from Affinity to Mailchimp — and it includes blocklisted people in the sync payload. When these contacts land in Mailchimp, they may re-enter the active audience unless explicitly suppressed. FlitStack AI audits your Affinity blocklist before migration, filters out contacts without valid email addresses, and imports blocklisted persons with Mailchimp status 'unsubscribed' so your suppression rules are enforced from the first import. We also verify against Mailchimp's existing unsubscribe list to avoid duplicating suppression actions that would trigger an API error.

Mailchimp text merge fields cap at 255 characters — longer Affinity values truncate silently

Affinity custom text fields can hold values of any length, but Mailchimp merge fields of type TEXT enforce a 255-character limit. Values longer than 255 characters are accepted by the Mailchimp API but silently truncated, meaning your team may not realize a field value was cut until a Member record is reviewed in Mailchimp. FlitStack AI flags every truncation event in the migration report and offers two mitigations: either preserve the full value as a separate Notes entry on the Member record, or split the field into multiple merge fields with a documented naming convention your team can reference.

Affinity opportunity and deal data has no native home in Mailchimp — it must be stored as custom merge fields

Affinity stores deal names, amounts, stages, close dates, and owner assignments on Opportunity records linked to Persons. Mailchimp has no Opportunity, Pipeline, or Stage object — it is an email marketing platform. We preserve all Opportunity data as custom merge fields on each Member (DEAL_NAME, DEAL_AMOUNT, DEAL_STAGE, DEAL_CLOSE_DATE, DEAL_OWNER) so the information travels with the contact and is available for reference or segmentation logic. However, Mailchimp's Customer Journey builder cannot trigger on Opportunity stage changes because that event does not exist in Mailchimp — any deal-stage-based nurture sequences must be rebuilt using Mailchimp's available trigger events.

Affinity automations and workflows do not migrate — they must be rebuilt in Mailchimp Customer Journeys

Affinity automations trigger on Person events (email opens, Opportunity stage changes, date conditions, org changes) and execute actions like task creation, field updates, and list changes. Mailchimp Customer Journeys trigger on subscribe, campaign open or click, purchase, and date events — an entirely different event model. FlitStack AI cannot migrate automation logic between these incompatible engines. We export your Affinity automation definitions as a structured reference document so your Mailchimp admin can rebuild them. Basic list-subscription confirmations and birthday automations map to Mailchimp equivalents, but any Affinity automation referencing Opportunity data or relationship fields must be redesigned from scratch.

Affinity API enforces per-minute and per-month rate limits that extend migration timelines for large datasets

The Affinity REST API applies limits on calls per minute, calls per month, and concurrent requests per account. Large datasets — particularly when exporting Persons, Organizations, and Opportunity history — require pagination across multiple API requests. If your Affinity account is shared with active integrations, those integrations consume part of the monthly API quota. FlitStack AI manages request pacing against the Affinity rate limit headers returned in each response, distributes export calls across off-peak windows where possible, and surfaces any quota exhaustion events before they stall the migration so your team can decide whether to pause competing integrations.