The answer to this is not straight forward. The reason being, you are already tied into a commercial contract with your existing provider.
If you want, you can exit that contract, but that may have financial repercussions for early termination. Please check with your solution provider first.
In some instances your existing solution provider might be the very same solution provider offering these new remittance as a service pricing packages. If that is the case, there might be a possibility to downgrade or readjust your contract.