You must have created a database connector and an access connector before you can configure the cryptographic provider.
In your PostgreSQL Server VM, navigate to the directory where you installed the Policy Agent.
Create a config file psql.conf inside the /etc directory using the text from the Access Token (Identity and Secret). The file should be in json format similar to the following:
{ "identity" : "postgres_connector", "secret" :"S3XsZJe/EPNVf2D/YufOUS2HuOsLfKJBKjp3Zx/JIrODqWYRQaYiFWnqet4lPsW0VcvGSvH7yB9BUZIxGi7CaM68cZFtw6yY5IvaCl wD3344MFy28U9zjc0ayFRoHQi/Dv25xTZ8a2JLlxJRyavO2VNGaCPUZfFsPN4lZg3EZwJ3fNKa7Owfpk0AuHmWmcqcYsxNnUxPuc+VY qXZk17omHzYP/sA86RCv6+825t0EvuQhDHF7PxSiHjn+VShCYKNb+RxAvLglIP/eVx0k/HWWI6/bZPpxwjFtw3tqnJ/8toqPD+f+ZUl YT0mFRuE7BExGFf5LBCaVwf5FXKcOeXdaAg8zvaq0ynUjSB9JVw5FP6ZtFrY22hUcFcYDPITpjMzUzsX9d5BM8BhyTLmoPkj4lMyrSh 3/nwGlJqPLj92EylmKsSOtOP6irpN22A2omvTsXUP/pajuGrtUsKqzDdhAj+qmR2IDkSdOQMoSSvAgWylAuS6q8WdMvm8SVCVUZpQrL vm226NvfvGCHKKNZaQCdxvL4XIgKI/tCt+F+Xx0Pk/bkPgLby90IM5NtktRkroxakhGkgSnoyDj2KovGvIwrHLpFpvDJkCwxbBce+Op cOjxR2tZ3nDM2zoZraSviT0P+V2hh7Z0jAWd4YrRdooxtQc3VPjTOrdOBldCExetFk=" }
Alternatively, you can directly provide the copied Access Token to the open_session() function.