Task: Notify on new emails with invoices in Slack

n8n workflow JSON:
{"id":91,"name":"New invoice email notification","nodes":[{"name":"Check for new emails","type":"n8n-nodes-base.emailReadImap","position":[500,300],"parameters":{"format":"resolved","mailbox":"Inbox","options":{"allowUnauthorizedCerts":true}},"credentials":{"imap":{"id":"24","name":"GMAIL"}},"typeVersion":1},{"name":"If email body contains invoice","type":"n8n-nodes-base.if","position":[700,300],"parameters":{"conditions":{"string":[{"value1":"={{$json[\"text\"].toLowerCase()}}","value2":"invoice","operation":"contains"}]},"combineOperation":"any"},"typeVersion":1},{"name":"Extract the total amount","type":"n8n-nodes-base.mindee","position":[900,280],"parameters":{"rawData":true,"resource":"invoice","binaryPropertyName":"attachment_0"},"credentials":{"mindeeInvoiceApi":{"id":"62","name":"Mindee Invoice account"}},"typeVersion":1},{"name":"Send new invoice notification","type":"n8n-nodes-base.slack","position":[1580,300],"parameters":{"text":":new: There is a new invoice to pay :new:","channel":"team-accounts","blocksUi":{"blocksValues":[]},"attachments":[{"color":"#FFBF00","fields":{"item":[{"short":true,"title":"Amount","value":"={{$node[\"If Amount > 1000\"].json[\"predictions\"][0][\"total_incl\"][\"amount\"]}}"},{"short":false,"title":"From","value":"={{$node[\"Check for new emails\"].json[\"from\"][\"value\"][0][\"address\"]}}"},{"short":true,"title":"Subject","value":"={{$node[\"Check for new emails\"].json[\"subject\"]}}"}]},"footer":"=*Date:* {{$node[\"Check for new emails\"].json[\"date\"]}}"}],"otherOptions":{}},"credentials":{"slackApi":{"id":"53","name":"Slack Access Token"}},"typeVersion":1},{"name":"Send email to finance manager","type":"n8n-nodes-base.emailSend","position":[1340,120],"parameters":{"text":"Hi,\n\nThere is a new high value invoice to be paid that you may need to approve.\n\n~ n8n workflow","options":{},"subject":"New high value invoice","toEmail":"finance-manager@company.tld","fromEmail":"n8n@noreply.tld","attachments":"attachment_0"},"credentials":{"smtp":{"id":"26","name":"mailtrap"}},"typeVersion":1},{"name":"If Amount > 1000","type":"n8n-nodes-base.if","position":[1080,280],"parameters":{"conditions":{"number":[{"value1":"={{$json[\"predictions\"][0][\"total_incl\"][\"amount\"]}}","value2":1000,"operation":"larger"}]}},"typeVersion":1}],"active":false,"settings":{},"connections":{"If Amount > 1000":{"main":[[{"node":"Send email to finance manager","type":"main","index":0}],[{"node":"Send new invoice notification","type":"main","index":0}]]},"Check for new emails":{"main":[[{"node":"If email body contains invoice","type":"main","index":0}]]},"Extract the total amount":{"main":[[{"node":"If Amount > 1000","type":"main","index":0}]]},"Send email to finance manager":{"main":[[{"node":"Send new invoice notification","type":"main","index":0}]]},"If email body contains invoice":{"main":[[{"node":"Extract the total amount","type":"main","index":0}]]}}}