The easiest way to do that would be to use '>' or '>>' operand:
1. '>' - input
curl https://$vRa/catalog-service/api/consumer/requests/ > /path/to/doc.csv
The above command will save the output of the curl command to doc.csv located in '/path/to' directory. The content of doc.csv file would be completely erased and overwritten with the curl command output.
2. '>>' - add input
curl https://$vRa/catalog-service/api/consumer/requests/ >>/path/to/doc.csv
The above command will save the output of the curl command to doc.csv located in '/path/to' directory. The output of the curl command would be added under the last line of the existing content of doc.csv file.
Cheers,
Paul Wilk