All connections to Square must use the OAuth 2.0 authentication type option starting June 22, 2020. Previously, token-based authentication was offered to Square, but it will no longer be supported.
Warning: Token-based Square connections have been deprecated (automatically offline) as of June 22nd.
After you have successfully updated your connection, integration flows that use the Square connection will continue to work.
Please submit a support ticket if you have questions about Square token deprecation or experience any issues with the migration.