With a working phpipam install you can enable the api and use these interactions inside of playbooks. You will need to configure the app id and create a user that will be accessing this api in order to gather a token.
Inside of the gui you will need to navigate to the API section under administration. Here you can configure the app id for the API Next you will need to navigate to the Users section to create your API user
To find the subnets and to populate specific variables you'll need to poke around the API with postman or curl.
using curl to return a token:
curl -k https://ipam.example.com/api/phpipamappid/user/ -X POST -u <username>:<password>
grabbing the token from the returned json output:
curl -k https://ipam.example.com/api/phpipamappid/sections/ --header "token: .J1e9ipFZkPE6EvIRAqEf9hp" -X GET
Once you have the ID of the sections this can be used to get the subnets inside this section.
curl -k https://ipam.example.com/api/phpipamappid/sections/{ID}/subnets --header "token: .J1e9ipFZkPE6EvIRAqEf9hp" -X GET
This will list all of the subents in this section, and you'll want to grab the id from the returned objects
"id": <number>,
...
This is where the subnet_id: variable is populated.
main.yml playbook is an example of using the URI module to make an api call, register the output to populate variables, making calls to register an ip, and update phpipam's database.
To generate the encrypted value to populate the vault password for the api_pass variable you will need to generate this with ansible-vault. https://docs.ansible.com/ansible/2.4/vault.html
One all of the values in the group_vars/all file are set to match your environment and only then will the playbook succeed. Making the call to the API will pull down the token which is then stored in a variable and used throughout the playbook
phpipam documentation https://phpipam.net/api/api_documentation/