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"A credit card is a payment card issued to users as a system of payment. It allows the cardholder to pay for goods and services based on the holder's promise to pay for them. The issuer of the card creates a revolving account and grants a line of credit to the consumer (or the user) from which the user can borrow money for payment to a merchant or as a cash advance to the user." [Credit card. Wikipedia]
The UML component diagram example "Credit card agency" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Rapid UML solution from the Software Development area of ConceptDraw Solution Park.
UML component diagram
UML component diagram, system boundary, port, interface, component,
Used Solutions

UML diagram, UML modeling Rapid UML

UML diagram, UML modeling
Rapid UML solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils for quick drawing the UML diagrams using Rapid Draw technology.

entity-relationship diagram, ER-diagram, database ERD Entity-Relationship Diagram (ERD)

entity-relationship diagram, ER-diagram, database ERD
Entity-Relationship Diagram (ERD) solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils from drawing the ER-diagrams by Chen's and crow’s foot notations.