Don't know your ASPSP from your elbow?... find out more below!
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Open Banking uses various accronyms, the following provides a summary of the principal terms used:

Term Description
AISP Account Information Service Provider. Provide Access to account balances for example.
ASPSP Account Servicing Payment Service Provider. The Bank or Payment Institution. A TPP that provides Account Information Services.
CMA Competition and Markets Authority - agency responsible for the rollout of Open Banking in the UK
PISP Payment Initiation Service Provider. Provide Access to an API to create payments. A TPP that provides Payment Initiation Services.
PSU Payments Service User. The Person On The End Of The API Call.
TPP Third Party Providers / Trusted Third Parties A party other than an ASPSP that provides payment related services.