A system for communication between two or more computer programs is disclosed. The system includes a memory, an interface, and a processor. The memory stores a first file, expected metadata for the first file, and expected metadata for one or more fields in the first file. The interface receives a file from a computer program. The file comprises fields that each comprise information provided by one or more sources. The processor executes a second computer program which extracts a first set of file metadata from the received file, compares the extracted first set of file metadata to the expected metadata, and determines if the extracted first set of file metadata corresponds to the expected metadata. If the extracted first set of file metadata corresponds to the expected metadata for the first file, then the processor performs analogous comparisons at a field level and stores the first file in the memory.