How to move domains from iwantmyname to porkbun

I had been hosting this domain on iwantmyname.com for over 9 years. It's a great registrar, but I've found a cheaper one with more features at porkbun.com. I had a bunch of records for CNAMEs and also verification subdomains for various external services. I've written a bit of shell script to use the porkbun API (documented at https://porkbun.com/api/json/v3/documentation) to create the new records.

First create an API key in porkbun's control panel. Then copy the api key and the secret to the command below.

DOMAIN="my-domain-name.example.com"
OLDIFS=${IFS}

while IFS= read -r line; do
 IFS=${OLDIFS}
 while read -r record type addr; do
   printf 'line: record: %s type: %s addr: %s \n' "${record}" "${type}" "${addr}"
   curl  -H "Content-Type: application/json" --request POST --data '
   {
      "secretapikey": "xxxxxxxxxxxxxxxxxxxxx",
      "apikey": "xxxxxxxxxxxxxxxxxx",
      "name": "'"${record}"'",
      "type": "'"${type}"'",
      "content": "'"${addr}"'",
      "ttl": "600"
    }
      '  \
   https://porkbun.com/api/json/v3/dns/create/${DOMAIN}
 done <<< "${line}"
done < records.txt

My previous registrar iwantmyname doesn't have a good API (only a basic DDNS functionality), so I've copied the existing records from the web UI and massaged them with some vim macros into something like this in records.txt:

subdomain A ip.add.re.ss
subdomain CNAME othersubdomain 

Then I ran the script above on the existing records, et voilà, the records are moved from old registrar to the new one.