This is a simple Python wrapper around the PMC ID converter service.
from pmc_id_conv_client import PMCIDConverter, IDConvRequest, IDConvResult
converter = PMCIDConverter(email='<your-email>')
ids = ['PMC7611378']
req = IDConvRequest(ids=ids)
res_list = converter.convert_ids(req)
for r in res_list:
print(r)