If you are using Webhooks, Retention.com does not automatically cross-reference your existing contacts. You will need to manually upload your existing contacts so we don't identify or collect people you already have.
When to use this method
You are using Webhooks and
You are uploading your existing contacts for the first time on a new account
How to upload your existing contacts
The upload option is found inside your Webhook integration settings:
Log in to Retention.com
Go to Settings → Integrations
Open your Webhook integration
Find the Sync your existing contacts card
Upload your CSV file
Once uploaded, the file is sent to a processing queue. When complete, it will appear listed under the corresponding date in your Sync history.
File requirements
Your CSV must use one of the following formats:
Plain text emails: One column labeled
emailcontaining plain text email addresses
OR
MD5 hashes: One column labeled
MD5containing properly formatted MD5 hashes — check the "File contains MD5 encoded emails" checkbox when uploading
Additional requirements:
File must be an Excel .CSV
Maximum file size: 500MB — split into smaller files if needed
After uploading: Confirm the number of unique records in your Retention.com dashboard matches the count in your ESP.
How your data is handled
Uploaded contact lists are converted into encoded MD5 hashes for security. Retention.com does not use, share, or resell this data for any purpose other than preventing you from collecting and paying for contacts you already have.
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