How to properly set up a connection with the bank via SSL?

Question

Digital certificates

I'm sorry for such a simple question, but I've almost never encountered using SSL certificates before and now I have some questions.
PHP scripts are running on apache for the interaction between the bank and billing, as it turned out to be done in an insecure way before, now you need to configure SSL.
What is:
- generated an rsa key
- generated a CSR request and sent it to the bank to create a certificate
- received a certificate and registered it together with the key in the resource configuration file
However, when the bank tries to establish a connection, they receive an error 14094410
. ? Do I need to request a certificate authority file from the bank in order to register it in SSLCACertificateFile?

Answer 1

You can get a certificate without a bank. Moreover, if you work with the bank's API (send requests to them), then you don't need any certificates. If the bank sends requests to your system via API, then just buy a certificate from any well-known center or use Let's Encrypt to get a free one.
If a bank requires the use of only their certificates for work, then they must also provide instructions for obtaining, installing and configuring (providing, among other things, their certificates for building a chain).