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Explanation: ... or "one-stop [shop] appproach" is what I've used in the past.
Beate Lutzebaeck New Zealand Local time: 23:28 Native speaker of: German, English PRO pts in pair: 2079
43 mins confidence:
in one package
Explanation: as project mgt + external funding + service are all provided by the same company (therefore, I don't think we can speak about a "source" here - what would be the case if the "one hand" would apply to financing + service only).
One-stop shopping is fine, but it might not fit into the text, as it is more for everyday use.
Eva Blanar Hungary Local time: 11:28 Native speaker of: Hungarian PRO pts in pair: 247